Generate for-in-array loops with proper semantics in 1.3+

In Kotlin 1.3+, assignment to the for-in-array loop range variable in
the loop body doesn't affect loop execution (as if it was a loop on an
array iterator, or some other container).

 #KT-21354 In Progress
 #KT-21321 In Progress

compiler/testData/codegen/box/ranges/forInArrayWithArrayVarUpdatedInLoopBody12.kt

@@ -0,0 +1,13 @@
+// WITH_RUNTIME
+// LANGUAGE_VERSION: 1.2
+// IGNORE_BACKEND: JS
+
+fun box(): String {
+    var xs = intArrayOf(1, 2, 3)
+    var sum = 0
+    for (x in xs) {
+        sum = sum * 10 + x
+        xs = intArrayOf(4, 5)
+    }
+    return if (sum == 15) "OK" else "Fail: $sum"
+}