Change .hashCode() to .bar() for some nullability fixes tests

Hash code can be no more used because in 1.3 we have nullable extension.
This fixes two wrap with safe let call tests and
one surround with null check test.

idea/testData/quickfix/surroundWithNullCheck/unsafeCallInsideAnonymous.kt

@@ -1,6 +1,8 @@
 // "Surround with null check" "true"
 // WITH_RUNTIME
 
+fun Int.bar() = this
+
 fun foo(arg: Int?) {
-    run(fun() = arg<caret>.hashCode())
+    run(fun() = arg<caret>.bar())
 }

idea/testData/quickfix/surroundWithNullCheck/unsafeCallInsideAnonymous.kt.after

@@ -1,8 +1,10 @@
 // "Surround with null check" "true"
 // WITH_RUNTIME
 
+fun Int.bar() = this
+
 fun foo(arg: Int?) {
     if (arg != null) {
-        run(fun() = arg.hashCode())
+        run(fun() = arg.bar())
     }
 }