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

[Kostya Serebryany]

I did not give much thought to dynamic allocas, but what if we simply replace them with run-time calls somehow? 
Maybe we could reuse the FakeStack here somehow?

Alexey, you've been touching the Alloca's recently, and was going to touch them more. Thoughts?


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http://reviews.llvm.org/D7098

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