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

[Yury Gribov]

> OMG. I am curious, if you really have targets for which testing alloca is important...


Well, bugs do pop up in various OSS projects. Alloca is surprisingly widespread.

> Do we really need a list here?

>  Can't we handle the task with an integer indicating the combined sizes of allocas?


We could simply memset(0) all shadow memory corresponding to dynamic part of stack. But this wouldn't scale to use-after-return (as I understand alloca regions will not be consecutive in this case).


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http://reviews.llvm.org/D7098

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