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

[Leny Kholodov]

Changes:

- Slot.isIgnored() is used for detection of unused result;
- test case 'large_combiner_test()' has been added; it doesn't work with previous patch (http://reviews.llvm.org/D9743) and works now; after codegen this test has no lifetime scope, and clang detects results of internal calls as used.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10042

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

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