feat: exception handling rework: unwind argument as integer. #271
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Instead of using void* to represent the unwind argument, switch to using an int. The argument was really just an int all along ,and we were pretending it was a pointer to conform to the ABI. Future changes related to Address Spaces will require changes to the ABI anyway (the pointer would need an address space, probably multiple), so the least painful option is to just use int.