[PATCH] Implement variable-sized alloca instrumentation (take 2).

[Kostya Serebryany]

I'd prefer to hide as much as possible inside the run-time and have simplest possible compiler changes. 
Also, whenever possible, I prefer not to have linked lists. I am pretty sure we can solve this problem with an array.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7098

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