8319196: ExecutableElement.getReceiverType doesn't return receiver types for methods loaded from bytecode

src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symbol.java

@@ -2282,7 +2282,7 @@ public Type implicitReceiverType() {
             if (enclosingClass == null) {
                 return null;
             }
-            Type enclosingType = enclClass().type;
+            Type enclosingType = enclosingClass.type;
             if (isConstructor()) {
                 return enclosingType.getEnclosingType();
             }