POSIX_COMMIT_CHECKS adding for apple.

[devnexen]

No description provided.

[mjp41]

@devnexen thanks for thinking about this. You also need the equivalent to

https://github.com/microsoft/snmalloc/blob/master/src/pal/pal_bsd.h#L42-L44

to simulate actually removing the pages from being accessible. This is actually more important than the memset.

[devnexen]

Yes I know but unfortunately func-malloc* tests abort with it.

[mjp41]

Does it do that if we disable calling the MADV_FREE_REUSABLE, when we have the commit checks on? And remove the converse MADV_FREE_REUSE in that mode too?

[devnexen]

Unfortunately still does not still work (on Mac M1/ARM it should work on Mac Intel).

[devnexen]

With actual code both work under Mac Intel and ARM

[mjp41]

LGTM to me, but Clang format is unhappy
https://dev.azure.com/snmalloc/snmalloc/_build/results?buildId=1308&view=logs&j=fb683405-d979-52da-6de9-2541dff429a6&t=f66a877f-3a0c-5131-ec8c-e97d54dcc0fe

@davidchisnall, any comments?