Intrinsics for 'reversed': CharSequence.indices

#KT-21323 In Progress

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedCharSequenceIndices.kt

@@ -0,0 +1,15 @@
+// WITH_RUNTIME
+import kotlin.test.*
+
+fun box(): String {
+    val cs = "1111"
+    var sum = 0
+    for (i in cs.indices.reversed()) {
+        sum = sum * 10 + i + cs[i].toInt() - '0'.toInt()
+    }
+    assertEquals(4321, sum)
+
+    return "OK"
+}
+
+// 0 reversed