AVX512F: Add helper enumeration for ternary logic intrinsics.

AVX512F: Add helper enumeration for ternary logic intrinsics.

Sync with llvm change in https://reviews.llvm.org/D120307 to
add enumeration and truncate imm to unsigned char, so users could
use ~ on immediates.

gcc/ChangeLog:

	* config/i386/avx512fintrin.h (_MM_TERNLOG_ENUM): New enum.
	(_mm512_ternarylogic_epi64): Truncate imm to unsigned
	char to avoid error when using ~enum as parameter.
	(_mm512_mask_ternarylogic_epi64): Likewise.
	(_mm512_maskz_ternarylogic_epi64): Likewise.
	(_mm512_ternarylogic_epi32): Likewise.
	(_mm512_mask_ternarylogic_epi32): Likewise.
	(_mm512_maskz_ternarylogic_epi32): Likewise.
	* config/i386/avx512vlintrin.h (_mm256_ternarylogic_epi64):
	Adjust imm param type to unsigned char.
	(_mm256_mask_ternarylogic_epi64): Likewise.
	(_mm256_maskz_ternarylogic_epi64): Likewise.
	(_mm256_ternarylogic_epi32): Likewise.
	(_mm256_mask_ternarylogic_epi32): Likewise.
	(_mm256_maskz_ternarylogic_epi32): Likewise.
	(_mm_ternarylogic_epi64): Likewise.
	(_mm_mask_ternarylogic_epi64): Likewise.
	(_mm_maskz_ternarylogic_epi64): Likewise.
	(_mm_ternarylogic_epi32): Likewise.
	(_mm_mask_ternarylogic_epi32): Likewise.
	(_mm_maskz_ternarylogic_epi32): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx512f-vpternlogd-1.c: Use new enum.
	* gcc.target/i386/avx512f-vpternlogq-1.c: Likewise.
	* gcc.target/i386/avx512vl-vpternlogd-1.c: Likewise.
	* gcc.target/i386/avx512vl-vpternlogq-1.c: Likewise.
	* gcc.target/i386/testimm-10.c: Remove imm check for vpternlog
	insns since the imm has been truncated in intrinsic.