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

[Ana Pazos]

================
Comment at: lib/CodeGen/BranchFolding.cpp:735
@@ +734,3 @@
+    if (MII.mayLoad() || MII.mayStore())
+      MII.clearMemRefs();
+}
----------------
hfinkel wrote:
> We can do better than this. Don't remove the MMOs if we're tail merging two instructions that have identical MMOs.
> 
Thanks for the suggestion Hal. Chad is OOO, I will uplload a new patch so we can continue the discussion.

http://reviews.llvm.org/D7769

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