KT-12733 'rangeTo' as a non-qualified call is not optimized in 'for'

Use ResolvedCall corresponding to 'for' loop range expression
for optimized "for-in-range-literal".
Cleanup.

compiler/testData/codegen/bytecodeText/forLoop/forInRangeWithImplicitReceiver.kt

@@ -0,0 +1,13 @@
+fun Int.digitsUpto(end: Int): Int {
+    var sum = 0
+    for (i in rangeTo(end)) {
+        sum = sum*10 + i
+    }
+    return sum
+}
+
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast