[PATCH] [GlobalMerge] Look at uses to create smaller global sets.

[Ahmed Bougacha]

You're right Eric, the "Enable" was redundant, removed.  I also added a couple of block comments explaining 1) why we don't just merge everything and call it a day, and 2) an overview of the algorithm used to look at the uses

Thanks!

-Ahmed


http://reviews.llvm.org/D8070

Files:
  lib/CodeGen/GlobalMerge.cpp
  test/CodeGen/AArch64/global-merge-group-by-use.ll
  test/CodeGen/AArch64/global-merge-ignore-single-use.ll

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