Consider using `MAP_JIT` on macOS about dynasm-rs HOT 1 OPEN

Interesting, seems like Apple probably also ran into perf bottlenecks with memory protection swapping due to needing to JIT x64 code, so they added a thread-based switch that alters the behaviour of page table permission checks without needing to edit them (and the fairly expensive cache flushes that that tends to cause).

I have no apple hardware myself (I'm just a student who wrote this initially for a fun side project). So it's hard to validate these things, but then again, this is the reason dynasmrt exports basically all the needed components to construct your own custom assemblers as there's too many different but valid ways that you might want to manage your JIT memory. It's therefore probably not needed for this support to be in tree, but let me know if you're missing any components that could be reused outside of the internals of dynasmrt that aren't exported.

from dynasm-rs.