[X86] Introduce a new td file to hold patterns some of the non instruction patterns from SSE and AVX512
This patch moves some of similar non-instruction patterns from X86InstrSSE.td and X86InstrAVX512.td to a common file.
This is intended as a starting point. There are many other optimization patterns that exist in both files that we could move here.
Differential Revision: https://reviews.llvm.org/D37455
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312649
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