[asan] don't do AsanDie twice

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@150641 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_rtl.cc b/lib/asan/asan_rtl.cc
index b8c485e..70e4383 100644
--- a/lib/asan/asan_rtl.cc
+++ b/lib/asan/asan_rtl.cc
@@ -102,6 +102,8 @@
 }
 
 void AsanDie() {
+  static int num_calls = 0;
+  if (AtomicInc(&num_calls) > 1) return;  // Don't die twice.
   if (FLAG_sleep_before_dying) {
     Report("Sleeping for %d second(s)\n", FLAG_sleep_before_dying);
     SleepForSeconds(FLAG_sleep_before_dying);