901f7b2cb7
restart instruction bits in the PSR. As such, we were returning from interrupt to the instruction in the bundle that caused us to enter the kernel, only now we're returning to a completely different bundle. While close here: add two KASSERTs to make sure that we restore sync contexts only when entered the kernel through a syscall and restore an async context only when entered the kernel through an interrupt, trap or fault. While not exactly here, but close enough: use suword64() when we copy the dirty registers from the kernel stack to the user stack. The code was intended to be be replaced shortly after being added, but that was a couple of weeks ago. I might as well avoid that it is a source for panics until it's replaced.
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