Allow to use scala.collection.concurrent.TrieMap

[WojciechMazur]

• Implements java dependencies and adapts TrieMap implementation to use Intrinsic based atomic field updaters
• Removed to longer required Scala 2 sources filtering for scala.collection.parallel
• Updated ignored lists of Scala2 partest junit tests to test TrieMap and other concurrent types
• Use TrieMap instead of not concurrent aware implementation of java.util.concurrent.CouncurrentHashMap

[armanbilge]

Is there still a plan to port ConcurrentHashMap at a later point? I'd have to read the paper again but I think TrieMap makes different performance trade-offs than ConcurrentHashMap to support some special features.

[WojciechMazur]

Yes, at some point I wish we port all the collections from JSR-166. The implementation ported from Scala.js is great, but I'm worried that it's not safe enough for usage in a multithreading environment.

[armanbilge]

The implementation ported from Scala.js is great, but I'm worried that it's not safe enough for usage in a multithreading environment.

Oh, definitely cannot use the current implementation in multi-threading :) we rely a lot on ConcurrentHashMap in Cats Effect.