Add support for creating threads on ARM #355
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Making this API arch-independent seems like a more sane approach, but there is another copy of these functions in ia2_get_pkey.h. I assumed that this was to be able to call it without changing into the compartment with libia2.a but it seems like we don't include it anywhere so it may be dead code. I fixed the usage of this API in the tests in a separate commit but we still need to fix it in PartitionAlloc and its shim.
Note: this needs x18 switching in the call gates to pass
This will make it easier to avoid duplicating code when adding the arm implementation.
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The threads test now builds and should work modulo stack alignment in
ia2_thread_begin. Running the test hits a fault before it gets to create a thread, but I need to review the test handler header ARM impl before relying on tests' error messages.