RISC-V: Enable vec_int testsuite for RVV VLA vectorization

RISC-V: Enable vec_int testsuite for RVV VLA vectorization

This patch is the final version of enabling vect_int test for RVV.

There are still 80+ FAILs and they can't be fixed by adjusting testcases or target-supports.exp

Here is the analysis of **ALL** FAILs:

1. REAL highest priority FAILs:

ICE:

FAIL: gcc.dg/vect/vect-live-6.c (internal compiler error: in force_align_down_and_div, at poly-int.h:1903)
FAIL: gcc.dg/vect/vect-live-6.c (test for excess errors)
FAIL: gcc.dg/vect/vect-live-6.c -flto -ffat-lto-objects (internal compiler error: in force_align_down_and_div, at poly-int.h:1903)
FAIL: gcc.dg/vect/vect-live-6.c -flto -ffat-lto-objects (test for excess errors)

Execution fails:
FAIL: gcc.dg/vect/slp-reduc-7.c -flto -ffat-lto-objects execution test
FAIL: gcc.dg/vect/slp-reduc-7.c execution test
FAIL: gcc.dg/vect/vect-alias-check-10.c -flto -ffat-lto-objects execution test
FAIL: gcc.dg/vect/vect-alias-check-10.c execution test
FAIL: gcc.dg/vect/vect-alias-check-11.c -flto -ffat-lto-objects execution test
FAIL: gcc.dg/vect/vect-alias-check-11.c execution test
FAIL: gcc.dg/vect/vect-alias-check-12.c -flto -ffat-lto-objects execution test
FAIL: gcc.dg/vect/vect-alias-check-12.c execution test
FAIL: gcc.dg/vect/vect-alias-check-14.c -flto -ffat-lto-objects execution test
FAIL: gcc.dg/vect/vect-alias-check-14.c execution test
FAIL: gcc.dg/vect/vect-double-reduc-5.c -flto -ffat-lto-objects execution test
FAIL: gcc.dg/vect/vect-double-reduc-5.c execution test

These FAILs are REAL problem that we need to address first.

2. Missed optimizations due to lacking VLS modes patterns:

FAIL: gcc.dg/vect/pr57705.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 1 loop" 2
FAIL: gcc.dg/vect/pr57705.c scan-tree-dump-times vect "vectorized 1 loop" 2
FAIL: gcc.dg/vect/pr65518.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 0 loops in function" 2
FAIL: gcc.dg/vect/pr65518.c scan-tree-dump-times vect "vectorized 0 loops in function" 2
FAIL: gcc.dg/vect/slp-1.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 4
FAIL: gcc.dg/vect/slp-1.c scan-tree-dump-times vect "vectorizing stmts using SLP" 4
FAIL: gcc.dg/vect/slp-12a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-12a.c scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-16.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-16.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-34-big-array.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-34-big-array.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-34.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-34.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-35.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-35.c scan-tree-dump-times vect "vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-43.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 1 loops" 13
FAIL: gcc.dg/vect/slp-43.c scan-tree-dump-times vect "vectorized 1 loops" 13
FAIL: gcc.dg/vect/slp-45.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 1 loops" 13
FAIL: gcc.dg/vect/slp-45.c scan-tree-dump-times vect "vectorized 1 loops" 13
FAIL: gcc.dg/vect/slp-47.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-47.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-48.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-48.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2

These testcases need VLS modes vec_init patterns.

FAIL: gcc.dg/vect/vect-bic-bitmask-12.c -flto -ffat-lto-objects  scan-tree-dump dce7 "<=\\s*.+{ 255,.+}"
FAIL: gcc.dg/vect/vect-bic-bitmask-12.c scan-tree-dump dce7 "<=\\s*.+{ 255,.+}"
FAIL: gcc.dg/vect/vect-bic-bitmask-23.c -flto -ffat-lto-objects  scan-tree-dump dce7 "<=\\s*.+{ 255, 15, 1, 65535 }"
FAIL: gcc.dg/vect/vect-bic-bitmask-23.c scan-tree-dump dce7 "<=\\s*.+{ 255, 15, 1, 65535 }"

These testcases need VLS modes VCOND_MASK and vec_cmp patterns.

3. Maybe bogus dump check FAILs:

FAIL: gcc.dg/vect/vect-multitypes-11.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 1 loops" 1
FAIL: gcc.dg/vect/vect-multitypes-11.c scan-tree-dump-times vect "vectorized 1 loops" 1
FAIL: gcc.dg/vect/vect-outer-4c-big-array.c -flto -ffat-lto-objects  scan-tree-dump-times vect "zero step in outer loop." 1
FAIL: gcc.dg/vect/vect-outer-4c-big-array.c scan-tree-dump-times vect "zero step in outer loop." 1
FAIL: gcc.dg/vect/vect-reduc-dot-s16a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-s16a.c scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-s8a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-s8a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_widen_mult_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-s8a.c scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-s8a.c scan-tree-dump-times vect "vect_recog_widen_mult_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-s8b.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_widen_mult_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-s8b.c scan-tree-dump-times vect "vect_recog_widen_mult_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-u16b.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-u16b.c scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-u8a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-u8a.c scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-u8b.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-dot-u8b.c scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-1a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-1a.c scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-1b-big-array.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-1b-big-array.c scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-1c-big-array.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-1c-big-array.c scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-2a.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-2a.c scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-2b-big-array.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/vect-reduc-pattern-2b-big-array.c scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
FAIL: gcc.dg/vect/wrapv-vect-reduc-dot-s8b.c scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected" 1
FAIL: gcc.dg/vect/wrapv-vect-reduc-dot-s8b.c scan-tree-dump-times vect "vect_recog_widen_mult_pattern: detected" 1

These testcases because we don't support widen_sum/vec_unpack....etc patterns.
Currently, we don't support them since we don't see the benefits.
May support those patterns if they are beneficial ? Or Fix testcases ?

Conclusion:

IMHO, I think we can merge this patch after we addressed all REAL highest priority issues (1).

The rest FAILs are not big issues then we can reduce them by supporting more features (For example VLS modes).

Feel free to give any comments.

gcc/testsuite/ChangeLog:

	* lib/target-supports.exp: Enable vect_int for RVV.