[PATCH] Add ASan hooks to BumpPtrAllocator

[Kostya Serebryany]

<grumble>
the annotations are provided for exactly this purpose, 
but still asan handles allocation much better if it fully controls malloc.
</grumble>


================
Comment at: include/llvm/Support/Allocator.h:229
@@ +228,3 @@
+      // Similarly, tell ASan about this space.
+#if LLVM_ADDRESS_SANITIZER_BUILD
+      ASAN_UNPOISON_MEMORY_REGION(AlignedPtr, Size);
----------------
I don't like so many ifdefs. 
Maybe like this? 

#if LLVM_ADDRESS_SANITIZER_BUILD
# include ... 
#else
  #define ASAN_POISON_MEMORY_REGION(a,b)  /*empty*/
#endif

http://reviews.llvm.org/D9757

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