AVX-512. 82/n. Add gather built-ins.

AVX-512. 82/n. Add gather built-ins.

gcc/
	* config/i386/i386.c
	(ix86_builtins): Add IX86_BUILTIN_GATHER3ALTSIV4DF,
	IX86_BUILTIN_GATHER3ALTDIV8SF, IX86_BUILTIN_GATHER3ALTSIV4DI,
	IX86_BUILTIN_GATHER3ALTDIV8SI.
	(ix86_expand_builtin):
	Handle IX86_BUILTIN_GATHER3ALTDIV8SF, IX86_BUILTIN_GATHER3ALTDIV8SI,
	IX86_BUILTIN_SCATTERSIV4DF, IX86_BUILTIN_SCATTERSIV4DI,
	IX86_BUILTIN_SCATTERDIV2DF, IX86_BUILTIN_SCATTERDIV4DF,
	IX86_BUILTIN_GATHER3ALTSIV4DI, IX86_BUILTIN_GATHER3ALTSIV4DF,
	IX86_BUILTIN_SCATTERDIV4DI, IX86_BUILTIN_SCATTERDIV2DI,
	IX86_BUILTIN_GATHER3SIV8SI, IX86_BUILTIN_GATHER3DIV8SI,
	IX86_BUILTIN_GATHER3SIV4DF, IX86_BUILTIN_GATHER3SIV4DI,
	IX86_BUILTIN_GATHER3DIV8SF, IX86_BUILTIN_GATHER3SIV8SF,
	IX86_BUILTIN_GATHER3DIV4DF, IX86_BUILTIN_GATHER3DIV2DF,
	IX86_BUILTIN_GATHER3DIV2DI, IX86_BUILTIN_GATHER3DIV4DI,
	IX86_BUILTIN_SCATTERDIV4SF, IX86_BUILTIN_SCATTERSIV2DI,
	IX86_BUILTIN_GATHER3SIV2DI, IX86_BUILTIN_GATHER3SIV4SI,
	IX86_BUILTIN_GATHER3SIV4SF, IX86_BUILTIN_GATHER3SIV2DF,
	IX86_BUILTIN_SCATTERSIV2DF, IX86_BUILTIN_SCATTERDIV4SI,
	IX86_BUILTIN_SCATTERSIV4SF, IX86_BUILTIN_SCATTERSIV4SI,
	IX86_BUILTIN_SCATTERDIV8SI, IX86_BUILTIN_GATHER3DIV4SI,
	IX86_BUILTIN_SCATTERSIV8SI, IX86_BUILTIN_SCATTERSIV8SF,
	IX86_BUILTIN_GATHER3DIV4SF, IX86_BUILTIN_SCATTERDIV8SF.
	(ix86_vectorize_builtin_gather): Update V2DFmode, V4DFmode, V2DImode,
	V4DImode, V4SFmode, V8SFmode, V4SImode, V8SImode.

Co-Authored-By: Andrey Turetskiy <andrey.turetskiy@intel.com>
Co-Authored-By: Anna Tikhonova <anna.tikhonova@intel.com>
Co-Authored-By: Ilya Tocar <ilya.tocar@intel.com>
Co-Authored-By: Ilya Verbin <ilya.verbin@intel.com>
Co-Authored-By: Kirill Yukhin <kirill.yukhin@intel.com>
Co-Authored-By: Maxim Kuznetsov <maxim.kuznetsov@intel.com>
Co-Authored-By: Michael Zolotukhin <michael.v.zolotukhin@intel.com>
From-SVN: r216795