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2766a47310
understand target implementation of any_extend / extload, just generate zero_extend in place of any_extend for liveouts when the target knows the zero_extend will be implicit (e.g. ARM ldrb / ldrh) or folded (e.g. x86 movz). rdar://12771555 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169536 91177308-0d34-0410-b5e6-96231b3b80d8
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