rs6000: Simplify some SSE4.1 "test" intrinsics

Copy some simple redirections from i386 <smmintrin.h>, for:
- _mm_test_all_zeros
- _mm_test_all_ones
- _mm_test_mix_ones_zeros

2021-10-11  Paul A. Clarke  <pc@us.ibm.com>

gcc
	* config/rs6000/smmintrin.h (_mm_test_all_zeros,
	_mm_test_all_ones, _mm_test_mix_ones_zeros): Rewrite as macro.