testsuite: Enable and adjust powerpc fold-vec-extract/insert testcases.

testsuite: Enable and adjust powerpc fold-vec-extract/insert testcases.

This patch enables a number of testcases on non-Linux targets, adjusts
the target requirements, and updates the expected results.

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/fold-vec-extract-char.p7.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-char.p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-char.p9.c: Remove target.
	Expect 3 addi for ilp32.
	* gcc.target/powerpc/fold-vec-extract-double.p7.c: Remove target.
	Add -mbig-endian for Linux.
	* gcc.target/powerpc/fold-vec-extract-double.p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-float.p7.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-float.p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-float.p9.c: Require lp64.
	* gcc.target/powerpc/fold-vec-extract-int.p7.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-int.p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-int.p9.c: Remove target.
	Expect 3 addi for ilp32.
	* gcc.target/powerpc/fold-vec-extract-longlong.p7.c: Remove target.
	Expect 4 addi for ilp32.
	* gcc.target/powerpc/fold-vec-extract-longlong.p8.c: Remove target.
	Expect 4 addi for ilp32.
	* gcc.target/powerpc/fold-vec-extract-longlong.p9.c: Require lp64.
	* gcc.target/powerpc/fold-vec-extract-short.p7.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-short.p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-extract-short.p9.c: Require lp64.
	* gcc.target/powerpc/fold-vec-insert-char-p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-char-p9.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-double.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-float-p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-float-p9.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-int-p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-int-p9.c: Remove target.
	Require 8 addi for ilp32.
	* gcc.target/powerpc/fold-vec-insert-longlong.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-short-p8.c: Remove target.
	* gcc.target/powerpc/fold-vec-insert-short-p9.c: Remove target.
	* gcc.target/powerpc/fold-vec-select-double.c: Remove target.
	* gcc.target/powerpc/fold-vec-select-float.c: Remove target.
	* gcc.target/powerpc/fold-vec-splats-int.c: Require lp64.
	* gcc.target/powerpc/fold-vec-splats-longlong.c: Require lp64.