disable interrupts for global mutex #488
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Possible fix for #393
Untested; to make sure this is viable, would need to demonstrate that (1) deadlocks actually occur without this fix, (2) this solves the deadlocks, and (3) there are no forseeable adverse affects from this additional logic.
On most platforms, disabling/enabling interrupts is a no-op, so there should be no performance impact on these platforms.
The main problem with this approach is I don't think it works with enclaves; I remember considering whether interrupts should be disabled for other environments besides the global environment (but it's been a while since I originally wrote this and I've forgotten why I didn't).