- InnerClasses & EnclosingMethod attributes for local classes

in multifile part members
- invocation of multifile part/facade members
(TODO: deserialized descriptor case)
- inlining of multifile part/facade members
(TODO: inline against binaries case)

compiler/testData/codegen/boxWithJava/fileClasses/multifileClassWithCrossCall/foo.kt

@@ -0,0 +1,5 @@
+@file:JvmName("Util")
+@file:JvmMultifileClass
+public fun foo(): String = foox()
+
+public fun barx(): String = "K"