[PATCH] Remove all MMOs from memory operations when tail merging.

[Ana Pazos]

Hi Hal,
I added all possible fields so we can agree on what we really need to check.
I think some of the fields we do need to check, like alignment, address space, flags.
Others like AAInfo, Ranges, I just checked the first entry, I did not go down the lists to check each metadata node. Probably we need to do that.
Let me know what you think.


http://reviews.llvm.org/D7769

Files:
  include/llvm/CodeGen/MachineInstr.h
  lib/CodeGen/BranchFolding.cpp

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