[X86][SSE] Remove PMULDQ/PMULUDQ by zero
Exposed by D50328 Differential Revision: https://reviews.llvm.org/D50328 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339337 91177308-0d34-0410-b5e6-96231b3b80d8
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