[PATCH] [sanitizer] Support adaptive stack unwinding in sanitizer tools.

[Kostya Serebryany]

================
Comment at: CMakeLists.txt:125
@@ -125,2 +124,3 @@
   -O3
+  -fno-omit-frame-pointer
   )
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please don't. This will hurt performance. 
If you absolutely insist, you may use this flag separately on the files with interceptors, but I will ask you to motivate such change 


http://llvm-reviews.chandlerc.com/D1378