backport: re PR target/79932 (_mm512_packus_epi32 does not compile under -O0)

backport: re PR target/79932 (_mm512_packus_epi32 does not compile under -O0)

	Backported from mainline
	2017-03-09  Jakub Jelinek  <jakub@redhat.com>

	PR target/79932
	* config/i386/avx512bwintrin.h (_mm512_packs_epi32,
	_mm512_maskz_packs_epi32, _mm512_mask_packs_epi32,
	_mm512_packus_epi32, _mm512_maskz_packus_epi32,
	_mm512_mask_packus_epi32): Move definitions outside of __OPTIMIZE__
	guarded section.

	* gcc.target/i386/pr79932-1.c: New test.

From-SVN: r248656