KT-12985 Do not create range instances for 'for' loop in CharSequence.indices

compiler/testData/codegen/bytecodeText/forLoop/forInIndices/forInCharSequenceIndices.kt

@@ -0,0 +1,15 @@
+// WITH_RUNTIME
+
+fun test(s: CharSequence): Int {
+    var result = 0
+    for (i in s.indices) {
+        result = result * 10 + (i + 1)
+    }
+    return result
+}
+
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast