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

[Kostya Serebryany]

> I've managed to build Firefox with dynamic allocas instrumentation enabled, is it big enough?


Yea, it's big, and I expect it to have quite a few allocas/VLAs

>   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.

I think you may commit this in the meantime.


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http://reviews.llvm.org/D7098

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