Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/localFunInLambda/localFunInLambda.2.kt

@@ -1,12 +0,0 @@
-package test
-
-public class Data(val value: Int)
-
-public class Input(val d: Data)  {
-    public fun data() : Int = 100
-}
-
-public inline fun <R> use(block: ()-> R) : R {
-    return block()
-}
-

compiler/testData/codegen/boxInline/localFunInLambda/localFunInLambda.kt

@@ -1,3 +1,19 @@
+// FILE: 1.kt
+
+package test
+
+public class Data(val value: Int)
+
+public class Input(val d: Data)  {
+    public fun data() : Int = 100
+}
+
+public inline fun <R> use(block: ()-> R) : R {
+    return block()
+}
+
+// FILE: 2.kt
+
 //NO_CHECK_LAMBDA_INLINING
 import test.*