* Delete `with-threaded-continuation' primitive.

* Delete `with-threaded-continuation' primitive.

* Implement `get-interrupt-enables' primitive.

* Split `primitive-type' and friends into two classes: one which is
gc-safe and touches arguments, the other non-safe with no touching.

* Implement primitive-procedure name aliasing in microcode.  This
allows microcode name changes to reuse existing bands.

* Do not use "-q" ld switch.  This causes lossage when Scheme is
loaded over NFS.