cleanup anonymous type when asked for variable type

check that effective cast type will help (IDEA-190473)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/addTypeCast/beforeNonDenotableLType.java

@@ -0,0 +1,11 @@
+// "Cast to 'java.lang.Object'" "false"
+class Scope<T> {
+    T val;
+    void f() {
+        var y = new Object();
+        var x = new Object() {
+            int a = 12;
+        };
+        x =<caret> val;
+    }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/addTypeCast/beforeNonDenotableVarType.java

@@ -0,0 +1,10 @@
+// "Cast to 'java.lang.Object'" "false"
+class A {
+    void f() {
+        var y = new Object();
+        var x = new Object() {
+            int a = 12;
+        };
+        x = <caret>y;
+    }
+}