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

[Ahmed Bougacha]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8070

Files:
  llvm/trunk/lib/CodeGen/GlobalMerge.cpp
  llvm/trunk/test/CodeGen/AArch64/global-merge-group-by-use.ll
  llvm/trunk/test/CodeGen/AArch64/global-merge-ignore-single-use.ll
  llvm/trunk/test/CodeGen/ARM/2010-12-15-elf-lcomm.ll
  llvm/trunk/test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll
  llvm/trunk/test/CodeGen/ARM/2011-06-29-MergeGlobalsAlign.ll
  llvm/trunk/test/CodeGen/ARM/2011-08-02-MergedGlobalDbg.ll
  llvm/trunk/test/CodeGen/ARM/global-merge-addrspace.ll
  llvm/trunk/test/CodeGen/ARM/global-merge.ll

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