Fix for-in iterator over array of boxed inline class values

#KT-25324 Fixed

compiler/testData/codegen/box/inlineClasses/iterateOverArrayOfInlineClassValues.kt

@@ -0,0 +1,16 @@
+// !LANGUAGE: +InlineClasses
+// WITH_RUNTIME
+// IGNORE_BACKEND: JVM_IR
+// IGNORE_BACKEND: JS_IR
+
+inline class Foo(val arg: Int)
+
+fun box(): String {
+    val arr = arrayOf(Foo(1), Foo(2))
+    var sum = 0
+    for (el in arr) {
+        sum += el.arg
+    }
+
+    return if (sum != 3) "Fail" else "OK"
+}