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

[Alexey Samsonov]

* Add a commandline flag to switch between new and old behavior
* Don't use dynamic alloca if a function has inline assembly
* Remove unnecessary argument in __asan_stack_free() function.

This is stil pretty much a WIP, I need to update the tests and check
performance. However, in this form the change seems to be pretty
stable on the codebases I've tested.

http://reviews.llvm.org/D6465

Files:
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
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