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Their is a detailed description of the new stack locking scheme in the PR here https://github.com/openjdk/jdk/pull/10907
JavaScript handles the "no identity hash" with WeakMap and WeakSet, which are language built-ins. For Virgil, I chose to leave out identity hashes and don't really regret it. It keeps the language simple and the separation clear. HashMap (entirely library code, not a language wormhole) takes the hash function and equality function as arguments to the constructor.
[1] https://github.com/titzer/virgil/blob/master/lib/util/Map.v3
This is partly my style too; I try to avoid using maps for things unless they are really far flung, and the things that end up serving as keys in one place usually end up serving as keys in lots of other places too.