FORBIDDEN_INC_DEC_CLASSES

[Hans-Peter Nilsson]

On Thu, 13 Jun 2002, Aldy Hernandez wrote:
> this macro is used in regclass and is not defined in any of the
> ports.  it's also undocumented.

I thought I might have a need for it so I looked.  It's derived;
internal-only for regclass.c.  See regclass.c:56 (for 1.150).

> can we get rid of this?

(Might still be possible; dunno.)

brgds, H-P