[PATCH] [asan] Implement delayed activation of AddressSanitizer

[Kostya Serebryany]

  LGTM modulo use of namespace,
  but let others (samsonov and/or glider?) have a look at this CL and at the removal of zero-based shadow.


================
Comment at: lib/asan/asan_activation.h:18
@@ +17,3 @@
+
+void AsanStartDeactivated();
+void AsanActivate();
----------------
doesn't it have to be in __asan namespace?

================
Comment at: lib/asan/asan_activation.cc:20
@@ +19,3 @@
+
+using namespace __asan;
+
----------------
namespace __asan { ?


http://llvm-reviews.chandlerc.com/D2553