LocalsOrMyInstanceFieldsControlFlowPolicy#isLocalOrMyInstanceReference extracted

Fixes parentheses handling like (this).x. Review ID: IDEA-CR-33345

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting/AssignToFinal.java

@@ -251,4 +251,14 @@ class QualifiedThis {
     <error descr="Cannot assign a value to final variable 'x'">QualifiedThis.this.x</error> = 5;
     this.x = 5;
   }
+}
+
+class ParenthesizedThis {
+  final int x;
+  final int y = (this).x + 1; // allowed as qualifier is not naked 'this'!
+
+  ParenthesizedThis() {
+    <error descr="Cannot assign a value to final variable 'x'">(this).x</error> = 5;
+    this.x = 6;
+  }
 }