[PATCH] [CodeGen] Reuse stack space from unused function results (with more accurate unused result detection)

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10042

Files:
  cfe/trunk/lib/CodeGen/CGCall.cpp
  cfe/trunk/lib/CodeGen/CGCall.h
  cfe/trunk/lib/CodeGen/CGExprAgg.cpp
  cfe/trunk/test/CodeGenCXX/stack-reuse-miscompile.cpp
  cfe/trunk/test/CodeGenCXX/stack-reuse.cpp

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