6988439: Parallel Class Loading test deadlock involving MethodData_lock and Pending List Lock

Don't acquire methodData_lock while holding pending list lock

Reviewed-by: kvn, never, ysr

hotspot/src/share/vm/oops/methodOop.cpp

@@ -309,6 +309,12 @@ void methodOopDesc::print_invocation_count() {
 // Build a methodDataOop object to hold information about this method
 // collected in the interpreter.
 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) {
+  // Do not profile method if current thread holds the pending list lock,
+  // which avoids deadlock for acquiring the MethodData_lock.
+  if (instanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
+    return;
+  }
+
   // Grab a lock here to prevent multiple
   // methodDataOops from being created.
   MutexLocker ml(MethodData_lock, THREAD);