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

[Yury Gribov]

> > I'm also found a "bug" there and I'm trying to understand if it's a real bug (not just unpoisoning error or something like that).

> 

> 

> Let us know how it goes.


That one turned out to be false positive - JS engine was allocating frame for asm stub via alloca, then freeing and re-using it inside the stub.


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http://reviews.llvm.org/D7098

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