[X86] Turn setne X, signedmin into setgt X, signedmin in LowerVSETCC to avoid an invert

This will fix one of the regressions from D42948.

Differential Revision: https://reviews.llvm.org/D43531

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325840 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed