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

[Kostya Serebryany]

LGTM
Looks simple enough.
This is still off by default, right? Did you test it on something huge?


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================
Comment at: test/asan/TestCases/alloca_vla_interact.cc:12
@@ +11,3 @@
+
+#define RZ 32
+
----------------
Does it have to be a macro?

http://reviews.llvm.org/D7098

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