KT-11104 : quick fix "surround with null check"

idea/testData/quickfix/surroundWithNullCheck/unstableValue.kt

@@ -0,0 +1,12 @@
+// "Surround with null check" "false"
+// ACTION: Introduce local variable
+// ACTION: Add non-null asserted (!!) call
+// ACTION: Replace with safe (?.) call
+// ERROR: Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type Int?
+
+class My(var x: Int?) {
+
+    fun foo() {
+        x<caret>.hashCode()
+    }
+}