[interpreter] Clear pending message object on handler entry.

src/runtime/runtime-interpreter.cc

Index: src/runtime/runtime-interpreter.cc
diff --git a/src/runtime/runtime-interpreter.cc b/src/runtime/runtime-interpreter.cc
index 726190805cbe6d41094284bda9086ecd419075b7..2edbcf56741b6fbac3d2b6d965cf687d984a6764 100644
--- a/src/runtime/runtime-interpreter.cc
+++ b/src/runtime/runtime-interpreter.cc
@@ -253,5 +253,12 @@ RUNTIME_FUNCTION(Runtime_InterpreterTraceBytecodeExit) {
   return isolate->heap()->undefined_value();
 }
 
+RUNTIME_FUNCTION(Runtime_InterpreterClearPendingMessage) {
+  SealHandleScope shs(isolate);
+  DCHECK_EQ(0, args.length());
+  isolate->clear_pending_message();
+  return isolate->heap()->undefined_value();
+}
+
 }  // namespace internal
 }  // namespace v8