Andrew Kaster 06b6f838d6 AK: Use MacOS pthread_get_stacksize_np to get stack size for StackInfo ...

Seems Rust and OpenJDK both had issues with getting accurate stack size
for the main thread with MacOS Maverick and above. Apply a variant of
their workarounds. We could probably assume 8MB in all cases just to
be safe, as the only user of AK::StackInfo right now is lib JS's heap
for determining possible pointer candidates. But, this approach should
work if userspace apps start trying to add custom guard pages, as well.

2020-12-30 11:28:50 +01:00

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