[PATCH] [WIP] Use dynamic alloca for stack variables in ASan.

[Kostya Serebryany]

Please update the commit message.

================
Comment at: lib/Transforms/Instrumentation/AddressSanitizer.cpp:501
@@ -495,1 +500,3 @@
 
+  bool HasInlineAsm;
+  std::unique_ptr<CallInst> EmptyInlineAsm;
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HasNonEmptyInlineAsm?

http://reviews.llvm.org/D6465