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Summary: Use MemorySSA for memory dependency checking in the EarlyCSE pass at the start of the function simplification portion of the pipeline. We rely on the fact that GVNHoist runs just after this pass of EarlyCSE to amortize the MemorySSA construction cost since GVNHoist uses MemorySSA and EarlyCSE preserves it. This is turned off by default. A follow-up change will turn it on to allow for easier reversion in case it breaks something. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305146 91177308-0d34-0410-b5e6-96231b3b80d8
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