[X86] Introduce a new td file to hold patterns some of the non instruction...

[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

llvm-svn: 312649