8076579: Popping a stack frame after exception breakpoint sets last method param to exception

Summary: Null the InterpreterRuntime::member_name_arg_or_null return value when it is necessary
Reviewed-by: jbachorik, coleenp, twisti

src/share/vm/interpreter/interpreterRuntime.cpp

@@ -1306,6 +1306,8 @@ IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread,
       member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
     }
     thread->set_vm_result(member_name_oop);
+  } else {
+    thread->set_vm_result(NULL);
   }
 IRT_END
 #endif // INCLUDE_JVMTI