Fix pr101384-1.c code generation test.

Fix pr101384-1.c code generation test.

Add support for the compiler using XXSPLTIB reg,255 to load all 1's into a
register on power9 and above instead of using VSPLTI{B,H,W} reg,-1.

gcc/testsuite/
2022-01-12  Michael Meissner  <meissner@the-meissners.org>

	PR testsuite/102935
	* gcc.target/powerpc/pr101384-1.c: Update insn regexp for power9
	and power10.