Suppress '(x < y) ? a : 0 -> (x < y) & a' transform on X86 architectures with dedicated mask registers.

Patch by Aleksey Bader.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196386 91177308-0d34-0410-b5e6-96231b3b80d8