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

[Sergey Dmitrouk]

Hi aadg, rnk, rsmith, rjmccall,

Space on stack allocated for unused structures returned by functions was unused
even when it's lifetime didn't intersect with lifetime of any other objects that
could use the same space.

The test added also checks for named and auto objects.  It seems to make sense
to have this all in one place.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9743

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

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