Make sure leak detector properly works in case of workers. (#3495)

runtime/src/main/cpp/Runtime.cpp

@@ -265,4 +265,8 @@ KBoolean Konan_Platform_isDebugBinary() {
   return KonanNeedDebugInfo ? true : false;
 }
 
+void Kotlin_zeroOutTLSGlobals() {
+  InitOrDeinitGlobalVariables(DEINIT_THREAD_LOCAL_GLOBALS);
+}
+
 }  // extern "C"

runtime/src/main/cpp/Runtime.h

@@ -50,6 +50,9 @@ bool Kotlin_hasRuntime();
 // Appends given node to an initializer list.
 void AppendToInitializersTail(struct InitNode*);
 
+// Zero out all Kotlin thread local globals.
+void Kotlin_zeroOutTLSGlobals();
+
 #ifdef __cplusplus
 }
 #endif

runtime/src/main/cpp/Worker.cpp

@@ -466,6 +466,10 @@ void* workerRoutine(void* argument) {
     if (worker->processQueueElement(true) == JOB_TERMINATE) break;
   } while (true);
 
+  // Runtime deinit callback could be called when TLS is already zeroed out, so clear memory
+  // here explicitly. to make sure leak detector properly works.
+  Kotlin_zeroOutTLSGlobals();
+
   return nullptr;
 }