KT-1478 Quick fix for using nullable collection in "for in" expression

#KT-1478 Fixed

idea/testData/quickfix/expressions/fixNullableWithIteratorWithExclExcl.kt.after

@@ -0,0 +1,9 @@
+// "Add non-null asserted (!!) call" "true"
+class Some {
+    operator fun iterator(): Iterator<Int> = null!!
+}
+
+fun foo() {
+    val test: Some? = Some()
+    for (i in test!!) { }
+}