RISC-V: Remove xfail for some of the SLP tests
Due to recent middle-end cost model changes, now we can do more VLA SLP.
Fix these following regressions:
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-1.c scan-assembler \\tvand
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-1.c scan-assembler \\tvand
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-1.c scan-assembler \\tvid\\.v
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-1.c scan-assembler \\tvid\\.v
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-1.c scan-tree-dump-times optimized ".VEC_PERM" 1
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-1.c scan-tree-dump-times optimized ".VEC_PERM" 1
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-16.c scan-assembler \\tvid\\.v
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-16.c scan-assembler \\tvid\\.v
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-16.c scan-tree-dump-times optimized ".VEC_PERM" 1
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-16.c scan-tree-dump-times optimized ".VEC_PERM" 1
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-3.c scan-tree-dump-times optimized ".VEC_PERM" 1
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-3.c scan-tree-dump-times optimized ".VEC_PERM" 1
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-5.c scan-tree-dump-times optimized ".VEC_PERM" 1
XPASS: gcc.target/riscv/rvv/autovec/partial/slp-5.c scan-tree-dump-times optimized ".VEC_PERM" 1
Committed.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/autovec/partial/slp-1.c: Remove xfail of M2.
* gcc.target/riscv/rvv/autovec/partial/slp-16.c: Ditto.
* gcc.target/riscv/rvv/autovec/partial/slp-3.c: Ditto.
* gcc.target/riscv/rvv/autovec/partial/slp-5.c: Ditto.