Revamp trap(): make it more explicit which kinds of traps/faults we

can get (or not) and what we do with them. This fixes the behaviour
for NaT consumption and speculation faults in that we now don't panic
for user faults.

Remove the dopanic label and move the code to a function. This makes
it easier in the simulator to set a breakpoint.

While here, remove the special handling of the old break-based syscall
path and move it to where we handle the break vector. While here,
reserve a new break immediate for KSE. We currently use the old break-
based syscall to deal with restoring async contexts. However, it has
the side-effect of also setting the signal mask and callong ast() on
the way out. The new break immediate simply restores the context and
returns without calling ast().

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