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9e956ef129
Document the Dirty value more precisely, use it for the uninitialized DepResultTy value. Change reverse mappings to be from an instruction* instead of DepResultTy, and stop tracking other forms. This makes it more clear that we only care about the instruction cases. Eliminate a DepResultTy,bool pair by using Dirty in the local case as well, shrinking the map and simplifying the code. This speeds up GVN by ~3% on 403.gcc. llvm-svn: 60232
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