Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/smap/classFromDefaultPackage.kt

@@ -0,0 +1,27 @@
+// FILE: 1.kt
+
+class A {
+    inline fun foo() {}
+}
+
+// FILE: 2.kt
+
+fun box(): String {
+    A().foo()
+
+    return "OK"
+}
+
+//SMAP
+//classFromDefaultPackage.1.kt
+//Kotlin
+//*S Kotlin
+//*F
+//+ 1 classFromDefaultPackage.1.kt
+//ClassFromDefaultPackage_1Kt
+//+ 2 classFromDefaultPackage.2.kt
+//A
+//*L
+//1#1,20:1
+//2#2:21
+//*E