[X86] Generalize CVTTPD2DQ/CVTTPD2UDQ and CVTDQ2PD/CVTUDQ2PD opcodes. NFCI
Replace the CVTTPD2DQ/CVTTPD2UDQ and CVTDQ2PD/CVTUDQ2PD opcodes with general versions. This is an initial step towards similar FP_TO_SINT/FP_TO_UINT and SINT_TO_FP/UINT_TO_FP lowering to AVX512 CVTTPS2QQ/CVTTPS2UQQ and CVTQQ2PS/CVTUQQ2PS with illegal types. Differential Revision: https://reviews.llvm.org/D27072 llvm-svn: 287870
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