[PATCH] [CodeGen] Reuse stack space from unused function results

[Sergey Dmitrouk]

Address inline comments:

- remove ARM asm checks;
- add check for function calls between lifetime markers;
- replace `-O3` with `-O1 -disable-llvm-optzns`.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9743

Files:
  lib/CodeGen/CGCall.cpp
  test/CodeGenCXX/stack-reuse.cpp

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