Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/enclosingInfo/anonymousInLambda.kt

@@ -0,0 +1,23 @@
+// FILE: 1.kt
+
+package test
+
+inline fun <R> call(s: () -> R) = s()
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    val res = call {
+        { "OK" }
+    }
+
+    var enclosingMethod = res.javaClass.enclosingMethod
+    if (enclosingMethod?.name != "box") return "fail 1: ${enclosingMethod?.name}"
+
+    var enclosingClass = res.javaClass.enclosingClass
+    if (enclosingClass?.name != "AnonymousInLambda_1Kt") return "fail 2: ${enclosingClass?.name}"
+
+    return res()
+}