[X86][SSE] Shuffle blends with zero

[X86][SSE] Shuffle blends with zero

This patch generalizes the zeroing of vector elements with the BLEND instructions. Currently a zero vector will only blend if the shuffled elements are correctly inline, this patch recognises when a vector input is zero (or zeroable) and modifies a local copy of the shuffle mask to support a blend. As a zeroable vector input may not be all zeroes, the zeroable vector is regenerated if necessary.

Differential Revision: http://reviews.llvm.org/D14050

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251659 91177308-0d34-0410-b5e6-96231b3b80d8