[PATCH] asan: fix signal handling during stoptheworld

[Sergey Matveev]

lgtm w/nit


================
Comment at: lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc:106
@@ -105,3 +105,3 @@
   } else {
-    VReport(1, "Attached to thread %d.\n", tid);
+    VReport(2, "Attached to thread %d.\n", tid);
     // The thread is not guaranteed to stop before ptrace returns, so we must
----------------
why?

http://reviews.llvm.org/D8005

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