Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/complex/forEachLine.kt

@@ -0,0 +1,47 @@
+// FILE: 1.kt
+
+package test
+
+public class Input(val s1: String, val s2: String) {
+    public fun iterator() : Iterator<String> {
+        return arrayListOf(s1, s2).iterator()
+    }
+}
+
+public inline fun <T, R> T.use(block: (T)-> R) : R {
+    return block(this)
+}
+
+public inline fun Input.forEachLine(block: (String) -> Unit): Unit {
+    useLines { lines -> lines.forEach(block) }
+}
+
+public inline fun Input.useLines(block2: (Iterator<String>) -> Unit): Unit {
+        this.use{ block2(it.iterator()) }
+}
+
+// FILE: 2.kt
+
+import test.*
+import java.util.*
+
+
+fun sample(): Input {
+    return Input("Hello", "World");
+}
+
+fun testForEachLine() {
+    val list = ArrayList<String>()
+    val reader = sample()
+
+    reader.forEachLine{
+        list.add(it)
+    }
+}
+
+
+fun box(): String {
+    testForEachLine()
+
+    return "OK"
+}