Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/simple/simpleLambda.kt

@@ -0,0 +1,40 @@
+// FILE: 1.kt
+
+package test
+
+public class Data()
+
+public inline fun <T, R> T.use(block: (T)-> R) : R {
+    return block(this)
+}
+
+public inline fun use2() : Int {
+    val s = 100
+    return s
+}
+
+// FILE: 2.kt
+
+import test.*
+
+class Z {}
+
+fun test1() : Int {
+    val input = Z()
+    return input.use<Z, Int>{
+        100
+    }
+}
+
+fun test2() : Int {
+    val x = 1000
+    return use2() + x
+}
+
+
+fun box(): String {
+    if (test1() != 100) return "test1: ${test1()}"
+    if (test2() != 1100) return "test1: ${test2()}"
+
+    return "OK"
+}