Deal with prefixed loads/stores in tests, PR testsuite/100166

Deal with prefixed loads/stores in tests, PR testsuite/100166

This patch updates the various tests in the testsuite to treat plxv
and pstxv as being vector loads/stores.  This shows up if you run the
testsuite with a compiler configured with the option: --with-cpu=power10.

gcc/testsuite/
2021-06-03  Michael Meissner  <meissner@linux.ibm.com>

	PR testsuite/100166
	* gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a-pr63175.c:
	* gcc.target/powerpc/fold-vec-load-builtin_vec_xl-char.c:
	* gcc.target/powerpc/fold-vec-load-builtin_vec_xl-double.c:
	* gcc.target/powerpc/fold-vec-load-builtin_vec_xl-float.c:
	* gcc.target/powerpc/fold-vec-load-builtin_vec_xl-int.c:
	* gcc.target/powerpc/fold-vec-load-builtin_vec_xl-longlong.c:
	* gcc.target/powerpc/fold-vec-load-builtin_vec_xl-short.c:
	* gcc.target/powerpc/fold-vec-load-vec_vsx_ld-char.c:
	* gcc.target/powerpc/fold-vec-load-vec_vsx_ld-double.c:
	* gcc.target/powerpc/fold-vec-load-vec_vsx_ld-float.c:
	* gcc.target/powerpc/fold-vec-load-vec_vsx_ld-int.c:
	* gcc.target/powerpc/fold-vec-load-vec_vsx_ld-longlong.c:
	* gcc.target/powerpc/fold-vec-load-vec_vsx_ld-short.c:
	* gcc.target/powerpc/fold-vec-load-vec_xl-char.c:
	* gcc.target/powerpc/fold-vec-load-vec_xl-double.c:
	* gcc.target/powerpc/fold-vec-load-vec_xl-float.c:
	* gcc.target/powerpc/fold-vec-load-vec_xl-int.c:
	* gcc.target/powerpc/fold-vec-load-vec_xl-longlong.c:
	* gcc.target/powerpc/fold-vec-load-vec_xl-short.c:
	* gcc.target/powerpc/fold-vec-splat-floatdouble.c:
	* gcc.target/powerpc/fold-vec-splat-longlong.c:
	* gcc.target/powerpc/fold-vec-store-builtin_vec_xst-char.c:
	* gcc.target/powerpc/fold-vec-store-builtin_vec_xst-double.c:
	* gcc.target/powerpc/fold-vec-store-builtin_vec_xst-float.c:
	* gcc.target/powerpc/fold-vec-store-builtin_vec_xst-int.c:
	* gcc.target/powerpc/fold-vec-store-builtin_vec_xst-longlong.c:
	* gcc.target/powerpc/fold-vec-store-builtin_vec_xst-short.c:
	* gcc.target/powerpc/fold-vec-store-vec_vsx_st-char.c:
	* gcc.target/powerpc/fold-vec-store-vec_vsx_st-double.c:
	* gcc.target/powerpc/fold-vec-store-vec_vsx_st-float.c:
	* gcc.target/powerpc/fold-vec-store-vec_vsx_st-int.c:
	* gcc.target/powerpc/fold-vec-store-vec_vsx_st-longlong.c:
	* gcc.target/powerpc/fold-vec-store-vec_vsx_st-short.c:
	* gcc.target/powerpc/fold-vec-store-vec_xst-char.c:
	* gcc.target/powerpc/fold-vec-store-vec_xst-double.c:
	* gcc.target/powerpc/fold-vec-store-vec_xst-float.c:
	* gcc.target/powerpc/fold-vec-store-vec_xst-int.c:
	* gcc.target/powerpc/fold-vec-store-vec_xst-longlong.c:
	* gcc.target/powerpc/fold-vec-store-vec_xst-short.c:
	* gcc.target/powerpc/lvsl-lvsr.c:
	* gcc/testsuite/gcc.target/powerpc/pr86731-fwrapv-longlong.c:
	Update insn counts to account for power10 prefixed loads and
	stores.