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

[Kostya Serebryany]

In http://reviews.llvm.org/D7098#130041, @rnk wrote:

> It occurs to me that ASan would need to add exceptional cleanups, if we
>  want this to cleanup after exception.


Not necessary. 
E.g. fake stack does garbage collection in the run-time lib.


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http://reviews.llvm.org/D7098

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