- use ConcurrentHashMap as a cache of class loaders to module descriptors
- KClassImpl now has a lazy class descriptor and it manages property creation
by looking (also lazily) for the property descriptor in the corresponding
scope
- since deserialized descriptors have full information about where a JVM symbol
is located and what signature it has, new tests will begin to pass where
Kotlin model and Java reflection model differ, see classObjectVar.kt
