AVX-512. 83/n. Add scatter built-ins.

AVX-512. 83/n. Add scatter built-ins.

gcc/
	* config/i386/i386.c
	(ix86_init_mmx_sse_builtins):
	Define __builtin_ia32_gather3siv2df, __builtin_ia32_gather3siv4df,
	__builtin_ia32_gather3div2df, __builtin_ia32_gather3div4df,
	__builtin_ia32_gather3siv4sf, __builtin_ia32_gather3siv8sf,
	__builtin_ia32_gather3div4sf, __builtin_ia32_gather3div8sf,
	__builtin_ia32_gather3siv2di, __builtin_ia32_gather3siv4di,
	__builtin_ia32_gather3div2di, __builtin_ia32_gather3div4di,
	__builtin_ia32_gather3siv4si, __builtin_ia32_gather3siv8si,
	__builtin_ia32_gather3div4si, __builtin_ia32_gather3div8si,
	__builtin_ia32_gather3altsiv4df, __builtin_ia32_gather3altdiv8sf,
	__builtin_ia32_gather3altsiv4di, __builtin_ia32_gather3altdiv8si,
	__builtin_ia32_scattersiv8sf, __builtin_ia32_scattersiv4sf,
	__builtin_ia32_scattersiv4df, __builtin_ia32_scattersiv2df,
	__builtin_ia32_scatterdiv8sf, __builtin_ia32_scatterdiv4sf,
	__builtin_ia32_scatterdiv4df, __builtin_ia32_scatterdiv2df,
	__builtin_ia32_scattersiv8si, __builtin_ia32_scattersiv4si,
	__builtin_ia32_scattersiv4di, __builtin_ia32_scattersiv2di,
	__builtin_ia32_scatterdiv8si, __builtin_ia32_scatterdiv4si,
	__builtin_ia32_scatterdiv4di, __builtin_ia32_scatterdiv2di.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@216796 138bc75d-0d04-0410-961f-82ee72b054a4