tsan: fix clang -Wall build
Clang does not like classes with virtual functions but w/o virtual dtor.
Go does not like libstdc++ (operator delete).

llvm-svn: 177267
diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc b/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc
index 7f0f901..238baef 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc
@@ -31,6 +31,11 @@
   , dead_info() {
 }
 
+#ifndef TSAN_GO
+ThreadContext::~ThreadContext() {
+}
+#endif
+
 void ThreadContext::OnDead() {
   sync.Reset();
 }