Add the INTERNAL-APPLY-VAL return code. It replaces the procedure

Add the INTERNAL-APPLY-VAL return code.  It replaces the procedure
with the current value of Val and then proceeds to apply.  Apply
errors use this return code rather than INTERNAL-APPLY to restart.
Under normal operation there is no change since a POP-RETURN-ERROR
return code (which restores Val) is pushed as well, so to make use of
this feature the top few frames of the stack must be eliminated before
invoking the continuation.