[PATCH] Add ASan hooks to BumpPtrAllocator

[Alexey Samsonov]

================
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);
----------------
kcc wrote:
> 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
In fact, it's worth defining this macro in llvm/Support/Compiler.h, similar to what we do for MSan interface function `__msan_allocated_memory`

http://reviews.llvm.org/D9757

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