[cfe-commits] adding "-fasan" flag

[Kostya Serebryany]

Hello,

Please review the following patch which adds -fasan (AddressSanitizer) flag
to clang.
(Mostly prepared by Chandler Carruth).
The LLVM part of AddressSanitizer has been submitted as r144758.
This patch will allow to enable AddressSanitizer from the clang command
line.
http://codereview.appspot.com/5396042

Coming next in separate patches:
  - a patch to clang driver to pass linker flags for AddressSanitizer
(small)
  - the run-time library and the tests (big)

Thanks,

--kcc
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