KT-4820: Added new tests, introduced functionality to detect overridden functions, other minor fixes

idea/testData/intentions/removeForLoopIndicesIntention/inapplicableIndexUse.kt

@@ -1,7 +1,9 @@
 // IS_APPLICABLE: FALSE
-//ERROR: Unresolved reference: withIndices
-fun foo(b: List<Int>) {
+//WITH_RUNTIME
+
+fun foo(b: List<Int>) : Int {
     for ((i, <caret>c) in b.withIndices()) {
         return i
     }
+    return 0
 }