Add missing mask[z]_roundscale_[round]_s[d,s] intrinsics

Add missing mask[z]_roundscale_[round]_s[d,s] intrinsics

gcc/
	* config/i386/avx512fintrin.h (_mm_mask_roundscale_ss,
	_mm_maskz_roundscale_ss, _mm_maskz_roundscale_round_ss,
	_mm_maskz_roundscale_round_ss, _mm_mask_roundscale_sd,
	_mm_maskz_roundscale_sd, _mm_mask_roundscale_round_sd,
	_mm_maskz_roundscale_round_sd): New intrinsics.
	(_mm_roundscale_ss, _mm_roundscale_round_ss): Use
	__builtin_ia32_rndscales?_mask_round builtins instead of
	__builtin_ia32_rndscales?_round.
	* config/i386/i386-builtin.def (__builtin_ia32_rndscaless_round,
	__builtin_ia32_rndscalesd_round): Remove.
	(__builtin_ia32_rndscaless_mask_round,
	__builtin_ia32_rndscalesd_mask_round): New intrinsics.
	* config/i386/sse.md
	(avx512f_rndscale<mode><round_saeonly_name>): Renamed to ...
	(avx512f_rndscale<mode><mask_scalar_name><round_saeonly_scalar_name>):
	 ... this, adjust and add subst atrributes to make it maskable.

gcc/testsuite/
	* gcc.target/i386/avx512f-vrndscaless-1.c: Add scan-assembler-times
	directives for newly expected instructions.
	* gcc.target/i386/avx512f-vrndscalesd-1.c: Likewise.
	* gcc.target/i386/avx512f-vrndscaless-2.c
	(avx512f_test): Add tests for new intrinsics.
	* gcc.target/i386/avx512f-vrndscalesd-2.c: Likewise.
	* gcc.target/i386/avx-1.c (__builtin_ia32_rndscalefss_round,
	__builtin_ia32_rndscalefsd_round): Remove.
	(__builtin_ia32_rndscalefss_mask_round,
	__builtin_ia32_rndscalefsd_mask_round): Define.
	* gcc.target/i386/sse-13.c: Ditto.
	* gcc.target/i386/sse-23.c: Ditto.

From-SVN: r276986