p8vector-builtin-3.c: Add vec_pack test.

p8vector-builtin-3.c: Add vec_pack test.

gcc/testsuite/ChangeLog:

2018-06-08  Carl Love  <cel@us.ibm.com>

 	* gcc.target/powerpc/p8vector-builtin-3.c: Add vec_pack test. Update
	vpkudum counts.
 	* gcc.target/powerpc/p9-extract-3.c: Make second argument of
	vec_extract a signed int.
 	* gcc.target/powerpc/vec-cmp.c: Add vec_cmple, vec_cmpge tests. Update,
	vcmpgtsb, vcmpgtub, vcmpgtsh, vcmpgtuh, vcmpgtsw, vcmpgtsw, vcmpgtuw,
	vcmpgtsd, vcmpgtud.
	* gcc.target/powerpc/vsx-extract-4.c: Make second argument of
	vec_extract a signed int.
	* gcc.target/powerpc/vsx-extract-5.c: Make second argument of
	vec_extract a signed int.
 	* gcc.target/powerpc/vsx-vector-7.c (foo): Add tests for vec_sel and
	vec_xor builtins.  Update xxsel, xxlxor counts.

From-SVN: r261347