tsan_rtl_report.cc (ScopedReport::AddThread): Cherry pick upstream 224508 and 224755.

2015-03-11  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * tsan/tsan_rtl_report.cc (ScopedReport::AddThread): Cherry pick
        upstream 224508 and 224755.

From-SVN: r221356

libsanitizer/ChangeLog

+2015-03-11  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	* tsan/tsan_rtl_report.cc (ScopedReport::AddThread): Cherry pick
+	upstream 224508 and 224755.
+
 2015-03-09  Jakub Jelinek  <jakub@redhat.com>
 
 	PR sanitizer/63958

libsanitizer/tsan/tsan_rtl_report.cc

@@ -242,7 +242,8 @@ ThreadContext *IsThreadStackOrTls(uptr addr, bool *is_stack) {
 
 void ScopedReport::AddThread(int unique_tid, bool suppressable) {
 #ifndef TSAN_GO
-  AddThread(FindThreadByUidLocked(unique_tid), suppressable);
+  if (const ThreadContext *tctx = FindThreadByUidLocked(unique_tid))
+    AddThread(tctx, suppressable);
 #endif
 }