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[X86][SSE] Utilize ZeroableElements for canWidenShuffleElements
canWidenShuffleElements can do a better job if given a mask with ZeroableElements info. Apparently, ZeroableElements was being only used to identify AllZero candidates, but possibly we could plug it into more shuffle matchers. Original Patch by Zvi Rackover @zvi Differential Revision: https://reviews.llvm.org/D42044 llvm-svn: 336903
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