testsuite: fix gcc.target/powerpc ilp32 failures

testsuite: fix gcc.target/powerpc ilp32 failures

The recent vec insert code generation changes were not reflected in the
expected output for ilp32 targets.  This patch updates the expected
instructions and counts.

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/fold-vec-insert-char-p9.c: Adjust ilp32.
	* gcc.target/powerpc/fold-vec-insert-float-p9.c: Same.
	* gcc.target/powerpc/fold-vec-insert-int-p9.c: Same.
	* gcc.target/powerpc/fold-vec-insert-longlong.c: Same.
	* gcc.target/powerpc/fold-vec-insert-short-p9.c: Same.
	* gcc.target/powerpc/pr79251.p9.c: Same.