don't suggest casts for assignable types (IDEA-201457)

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

@@ -0,0 +1,7 @@
+// "Cast to 'java.lang.Noolean'" "false"
+class X {
+    boolean foo() {return true;}
+    static void bar() {
+        if (<caret>foo("")) {}
+    }
+}