J2K: generating "!is" instead of !(.. is ..)

j2k/testData/fileOrElement/codeSimplifications/NotIs.java

@@ -0,0 +1,6 @@
+class C {
+    void foo(Object o) {
+        if (!(o instanceof String)) return;
+        System.out.println("String");
+    }
+}

j2k/testData/fileOrElement/codeSimplifications/NotIs.kt

@@ -0,0 +1,6 @@
+class C {
+    fun foo(o: Any) {
+        if (o !is String) return
+        System.out.println("String")
+    }
+}