[X86][SSE] lowerAddSubToHorizontalOp - enable ymm extraction+fold

[X86][SSE] lowerAddSubToHorizontalOp - enable ymm extraction+fold

Limiting scalar hadd/hsub generation to the lowest xmm looks to be unnecessary - we will be extracting one upper xmm whatever, and we can remove a shuffle by using the hop which is inline with what shouldUseHorizontalOp expects to happen anyway.

Testing on btver2 (the main target for fast-hops) shows this is beneficial even for float ops where we have a 'shuffle' to extract the float result:
https://godbolt.org/z/0R-U-K

Differential Revision: https://reviews.llvm.org/D61426

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359786 91177308-0d34-0410-b5e6-96231b3b80d8