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As noted in D52747, if we prefer IR to use trunc for bool vectors rather than and+icmp, we can expose codegen shortcomings as seen here with masked store. Replace a hard-coded PCMPGT simplification with the more general demanded bits call to improve things. Differential Revision: https://reviews.llvm.org/D52964 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344048 91177308-0d34-0410-b5e6-96231b3b80d8
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