[PATCH] Enable Asan on Windows

[Reid Kleckner]

================
Comment at: lib/asan/asan_win_dll_thunk.cc:29
@@ +28,3 @@
+#else
+#define ABORT asm("int $3")
+#endif
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I think you need volatile or some other constraint to prevent gcc from removing this.

http://reviews.llvm.org/D5367