GH-475 bytecode is null, use scanMethod() instead

Author: thurka

visualvm/libs.profiler/lib.profiler/src/org/graalvm/visualvm/lib/jfluid/instrumentation/RecursiveMethodInstrumentor2.java

@@ -406,7 +406,7 @@ private boolean checkAndScanMethod(DynamicClassInfo clazz, String methodName, St
                 //if (!lookupInSuperIfNotFoundInThis && !checkSubclasses) System.out.println("Gonna scan potentially reachable " + className + "." + methodName + methodSignature);
                 scanBytecode(clazz, bytecode);
             } else if (constructorNotInstrumented) {
-                scanBytecode(clazz, bytecode);
+                scanMethod(clazz, idx);
             }
         }