Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/innerClasses/innerLambda.1.kt

@@ -1,10 +0,0 @@
-import test.*
-
-fun box(): String {
-    val x1 = foo1()()
-    if (x1 != "OK") return "fail 1: $x1"
-
-    foo2()().run()
-
-    return test.sideEffects
-}

compiler/testData/codegen/boxInline/innerClasses/innerLambda.kt

@@ -1,3 +1,5 @@
+// FILE: 1.kt
+
 package test
 
 inline fun foo1() = run {
@@ -15,3 +17,16 @@ inline fun foo2() = run {
         }
     }
 }
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    val x1 = foo1()()
+    if (x1 != "OK") return "fail 1: $x1"
+
+    foo2()().run()
+
+    return test.sideEffects
+}

compiler/testData/codegen/boxInline/innerClasses/kt10259.2.kt

@@ -1,5 +0,0 @@
-package test
-
-inline fun test(s: () -> Unit) {
-    s()
-}

compiler/testData/codegen/boxInline/innerClasses/kt10259.kt

@@ -1,3 +1,13 @@
+// FILE: 1.kt
+
+package test
+
+inline fun test(s: () -> Unit) {
+    s()
+}
+
+// FILE: 2.kt
+
 import test.*
 
 fun box(): String {