Add more tests for for-in-array

#KT-21354 Fixed Target versions 1.2.20
 #KT-21321 Fixed Target versions 1.2.20

compiler/testData/codegen/box/controlStructures/forInArray/forInDelegatedPropertyUpdatedInLoopBody.kt

@@ -0,0 +1,17 @@
+class Del<T>(var x: T) {
+    operator fun getValue(thisRef: Any?, kProp: Any) = x
+
+    operator fun setValue(thisRef: Any?, kProp: Any, value: T) {
+        x = value
+    }
+}
+
+fun box(): String {
+    var xs by Del(intArrayOf(1, 2, 3))
+    var sum = 0
+    for (x in xs) {
+        sum = sum * 10 + x
+        xs = intArrayOf(4, 5, 6)
+    }
+    return if (sum == 123) "OK" else "Fail: $sum"
+}

compiler/testData/codegen/box/controlStructures/forInArray/forInFieldUpdatedInLoopBody.kt

@@ -0,0 +1,16 @@
+var xs: IntArray = intArrayOf(1, 2, 3)
+    get() = field
+    set(ys) {
+        var sum = 0
+        for (x in field) {
+            sum = sum * 10 + x
+            field = intArrayOf(4, 5, 6)
+        }
+        if (sum != 123) throw AssertionError("sum=$sum")
+        field = ys
+    }
+
+fun box(): String {
+    xs = intArrayOf()
+    return "OK"
+}