testsuite: Fix gcc.dg/vect/vect-bitfield-write-[23].c on SPARC [PR107808]

testsuite: Fix gcc.dg/vect/vect-bitfield-write-[23].c on SPARC [PR107808]

The gcc.dg/vect/vect-bitfield-write-[23].c tests FAIL on 32 and 64-bit
SPARC:

FAIL: gcc.dg/vect/vect-bitfield-write-2.c -flto -ffat-lto-objects
scan-tree-dump-times vect "vectorized 1 loops" 1
FAIL: gcc.dg/vect/vect-bitfield-write-2.c scan-tree-dump-times vect
"vectorized 1 loops" 1
FAIL: gcc.dg/vect/vect-bitfield-write-3.c -flto -ffat-lto-objects
scan-tree-dump-times vect "vectorized 1 loops" 1
FAIL: gcc.dg/vect/vect-bitfield-write-3.c scan-tree-dump-times vect
"vectorized 1 loops" 1

As discussed in the PR, they require vect_long_long support, but fail
to require that.

This patch fixes this.

Tested on sparc-sun-solaris2.11 and i386-pc-solaris2.11.

2023-01-20  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/testsuite:
	PR testsuite/107808
	* gcc.dg/vect/vect-bitfield-write-2.c: Require vect_long_long.
	* gcc.dg/vect/vect-bitfield-write-3.c: Likewise.