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

[Maxim Ostapenko]

Sorry for delay, I was on vacation last week.

Proceeding Firefox testing, I've ran to several tests failures due to reasons pretty much similar to described above by Yura (allocating stack frame via alloca and some asm magic with deallocating after). After I'd worked around these allocas (asan_blacklist.txt was very helpful here), none of new test failures were popped up.

So, Konstantin, if you don't mind, I'll ask Yura to land this revision after retesting complete.


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http://reviews.llvm.org/D7098

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