Tests for obsolete KT-4798, KT-7288, KT-7046

#KT-4798 Obsolete
 #KT-7288 Obsolete
 #KT-7046 Obsolete

compiler/testData/codegen/box/arrays/kt7288.kt

@@ -0,0 +1,29 @@
+fun test(b: Boolean): String {
+    val a = if (b) IntArray(5) else LongArray(5)
+    if (a is IntArray) {
+        val x = a.iterator()
+        var i = 0
+        while (x.hasNext()) {
+            if (a[i] != x.next()) return "Fail $i"
+            i++
+        }
+        return "OK"
+    } else if (a is LongArray) {
+        val x = a.iterator()
+        var i = 0
+        while (x.hasNext()) {
+            if (a[i] != x.next()) return "Fail $i"
+            i++
+        }
+        return "OK"
+    }
+    return "fail"
+}
+
+fun box(): String {
+    if (test(true) != "OK") return "fail 1: ${test(true)}"
+
+    if (test(false) != "OK") return "fail 1: ${test(false)}"
+
+    return "OK"
+}

compiler/testData/codegen/box/intrinsics/infixCall.kt

@@ -0,0 +1,8 @@
+fun box(): String {
+    val o = "OK" charAt 0
+    val array = CharArray(2)
+    array[1] = 'K'
+    val k = array get 1
+
+    return "$o$k"
+}