[X86][SSE] Use SplitOpsAndApply to improve HADD/HSUB lowering

Improve AVX1 256-bit vector HADD/HSUB matching by using SplitOpsAndApply to split into 128-bit instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337568 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed