testsuite: Require vect_hw_misalign in gcc.dg/vect/vect-71.c [PR123197]

testsuite: Require vect_hw_misalign in gcc.dg/vect/vect-71.c [PR123197]

The gcc.dg/vect/vect-71.c test currently FAILs on SPARC (32 and 64-bit):

FAIL: gcc.dg/vect/vect-71.c scan-tree-dump-times vect "vectorized 1 loops" 1

The dump shows

gcc.dg/vect/vect-71.c:18:17: missed:   unsupported unaligned access
gcc.dg/vect/vect-71.c:20:17: missed:   not vectorized: relevant stmt not supported: ia[_1] = 0;

so the test needs to require vect_hw_misalign.

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

2026-01-05  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/testsuite:
	PR tree-optimization/123197
	* gcc.dg/vect/vect-71.c: Require vect_hw_misalign.