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X86 code to lower VSELECT messed a bit with the bits set in the mask of VSELECT when it knows it can be lowered into BLEND. Indeed, only the high bits need to be set for those and it optimizes those accordingly. However, when the mask is a compile time constant, the lowering will be handled by the generic optimizer and those modifications will generate bad code in the generic optimizer. This patch fixes that by preventing the optimization if the VSELECT will be handled by the generic optimizer. <rdar://problem/18675020> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220242 91177308-0d34-0410-b5e6-96231b3b80d8
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