[PATCH] Implement variable-sized alloca instrumentation.

[Kostya Serebryany]

================
Comment at: lib/asan/asan_report.cc:992
@@ +991,3 @@
+      case kAsanAllocaLeftMagic:
+        bug_descr = "alloca-underflow";
+        break;
----------------
ygribov wrote:
> kcc wrote:
> > Maybe dynamic-stack-buffer-overflow (for both left and right cases)? 
> I think Max did underflow to match messages for ordinary stack.
Yea... I think the "underflow" was not very useful. 
For this new thing I'd just go with a single dynamic-stack-buffer-overflow

http://reviews.llvm.org/D6055