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0c16176e29
Move the logic from BranchFolding to use the shared infrastructure for merging MMOs introduced in 256909. This has the effect of making BranchFolding more capable. In the process, fix a latent bug. The existing handling for merging didn't handle the case where one of the instructions being merged had overflowed and dropped MemRefs. This was a latent bug in the places the code was commoned from, but potentially reachable in BranchFolding. Once this is in, we're left with a single place to consider implementing MMO unique-ing as proposed in http://reviews.llvm.org/D15230. Differential Revision: http://reviews.llvm.org/D15913 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256966 91177308-0d34-0410-b5e6-96231b3b80d8
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