Update mimalloc to 2.2.4

[kleisauke]

No description provided.

[kleisauke]

This got me thinking, perhaps we should migrate this to a submodule? I'm not sure it's feasible for the system/ directory though, since it would complicate cloning (you'd need to use --recurse-submodules). I'm also not sure if emsdk already handles that.

[sbc100]

This got me thinking, perhaps we should migrate this to a submodule? I'm not sure it's feasible for the system/ directory though, since it would complicate cloning (you'd need to use --recurse-submodules). I'm also not sure if emsdk already handles that.

Emscripten already uses a couple of submodules (today they are only for developers / testing) but it should be fine to start using them more.

However, we already include copies of musl / libc++ / compiler-rt and libc++abi, so converting this tiny library to a submodule would not make much difference to amount of verbatim copying we have.

[sbc100]

lgtm if the tests pass.

Is this the latest official release?

[kleisauke]

Is this the latest official release?

Yes, this is the latest stable (non-beta) release. See e.g. https://github.com/microsoft/mimalloc/tags (v3.1.4 is still in beta).

[kleisauke]

Note: this was changed in microsoft/mimalloc@0b3cd51#diff-ceeeab7fe916469cce6ab04ba551f6a2411d093f5cb3374cf95f0a1f9bd674aaR203 and microsoft/mimalloc@8f87455#diff-dc7c5d6afe67633e8647bc21fb12adebb183b49dd43e6bd47e1b7a822587fbe0R17.