[racket-dev] Missing movable primitives in optimizer

Hi!

The file [plt] / racket / src / racket / src / optimize.c has a list
of movable primitives in lines 955-961. I think that scheme_mcons_proc
is missing. I read the definition and it’s very similar to
scheme_mcons_proc, so I guess that it should be included in the list.

Another possible inclusion is immutable_box, but
scheme_immutable_box_proc is not defined, so to add this more changes
are necessary.

Gustavo