[X86][SSE] SimplifyDemandedBitsForTargetNode - PCMPGT(0,X) sign mask
For PCMPGT(0, X) patterns where we only demand the sign bit (e.g. BLENDV or MOVMSK) then we can use X directly. Differential Revision: https://reviews.llvm.org/D57667 llvm-svn: 353051
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