Added new stack frame type for preservation frames (restore-regs).

Added new stack frame type for preservation frames (restore-regs).
Added a debugging-info method.

Changed the illegal-arg error handler for primitive procedures to
avoid using retry restarts when the primitive signalled a type or
range error when called from compiled code.  This is necessary because
the compiler assumes that if it calls a primitive just to raise an
error then teh primitive will not return.  This assumption allows type
inference to eliminate furthur checks.

In order to stop the debugger returning a value, the primitive should
be called `indirectly' via another compiler procedure which refuses to
return.  I.e instead of compiling the error CAR operation as
INVOKE:PRIMITIVE

  (#[primitive-procedure car] x)

call it like this:

  (signal-primitive-error '#[primitive-procedure car] x)

where SIGNAL-PRIMITIVE-ERROR is compiled like this:

  (define (signal-primitive-error primitive . arguments)
     (apply primitive arguments)
     (error "..."))