testsuite: Enable and adjust powerpc vec-extract and vsu testcases.

testsuite: Enable and adjust powerpc vec-extract and vsu testcases.

This patch remove unnecessary target requirements from many vec-extract
testcases and enables the vsu testcases on AIX.

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/sad-vectorize-1.c: Remove target.
	* gcc.target/powerpc/sad-vectorize-2.c: Remove target.
	* gcc.target/powerpc/vec-extract-v16qi-df.c: Remove target.
	* gcc.target/powerpc/vec-extract-v16qi.c: Remove target.
	* gcc.target/powerpc/vec-extract-v16qiu-df.c: Remove target.
	* gcc.target/powerpc/vec-extract-v16qiu.c: Remove target.
	* gcc.target/powerpc/vec-extract-v2df.c: Remove target.
	* gcc.target/powerpc/vec-extract-v2di.c: Require lp64.
	* gcc.target/powerpc/vec-extract-v4sf.c: Remove target.
	* gcc.target/powerpc/vec-extract-v4si-df.c: Remove target.
	* gcc.target/powerpc/vec-extract-v4si.c: Remove target.
	* gcc.target/powerpc/vec-extract-v4siu-df.c: Remove target.
	* gcc.target/powerpc/vec-extract-v4siu.c: Remove target.
	* gcc.target/powerpc/vec-extract-v8hi-df.c: Remove target.
	* gcc.target/powerpc/vec-extract-v8hi.c: Remove target.
	* gcc.target/powerpc/vec-extract-v8hiu-df.c: Remove target.
	* gcc.target/powerpc/vec-extract-v8hiu.c: Remove target.
	* gcc.target/powerpc/vec-init-1.c: Remove target.
	* gcc.target/powerpc/vec-init-2.c: Require lp64.
	* gcc.target/powerpc/vec-init-3.c: Require lp64.
	* gcc.target/powerpc/vec-init-4.c: Remove target.
	* gcc.target/powerpc/vec-init-5.c: Remove target.
	* gcc.target/powerpc/vec-init-6.c: Require lp64.
	* gcc.target/powerpc/vec-init-7.c: Require lp64.
	* gcc.target/powerpc/vec-init-8.c: Remove target.
	* gcc.target/powerpc/vec-init-9.c: Require lp64.
	* gcc.target/powerpc/vec-setup-double.c: Remove target.
	* gcc.target/powerpc/vec-setup-long.c: Remove target.
	* gcc.target/powerpc/vsu/vec-xl-len-13.c: Correct expected warnings.
	* gcc.target/powerpc/vsu/vsu.exp: Enable on AIX.