testsuite: Don't xfail gcc.dg/tree-ssa/ssa-dom-cse-2.c on 64-bit SPARC

testsuite: Don't xfail gcc.dg/tree-ssa/ssa-dom-cse-2.c on 64-bit SPARC

The gcc.dg/tree-ssa/ssa-dom-cse-2.c test currently XPASSes on 64-bit SPARC:

XPASS: gcc.dg/tree-ssa/ssa-dom-cse-2.c scan-tree-dump optimized "return 28;"

It is currently xfail'ed there, which should be removed.

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

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

	gcc/testsuite:
	* gcc.dg/tree-ssa/ssa-dom-cse-2.c (scan-tree-dump): Don't xfail on
	64-bit SPARC.