Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/smap/resolve/inlineIterator.kt

@@ -0,0 +1,36 @@
+// FILE: 1.kt
+
+package zzz
+
+public class A(val p: Int)
+
+operator inline fun A.iterator() = (1..p).iterator()
+
+//SMAP ABSENT
+
+// FILE: 2.kt
+
+import zzz.*
+
+fun box(): String {
+    var p = 0
+    for (i in A(5)) {
+        p += i
+    }
+
+    return if (p == 15) "OK" else "fail: $p"
+}
+
+//SMAP
+//inlineIterator.1.kt
+//Kotlin
+//*S Kotlin
+//*F
+//+ 1 inlineIterator.1.kt
+//InlineIterator_1Kt
+//+ 2 inlineIterator.2.kt
+//zzz/InlineIterator_2Kt
+//*L
+//1#1,24:1
+//5#2:25
+//*E