reg-stack.c potpourri

[Lucas (a.k.a T-Bird or bsdfan3)]

1) What would need to be done to reg-stack.c to allow other ports 
besides i386 to use it?  (support for multiple-stack machines would be 
REALLY nice, but rather far off)  (any other ideas?)
2)  I found a minor bug in the header comment for reg-stack.c -- when 
whoever wrote the comment documented "push" insns, they said SET_DEST 
was two things at the same time and never said what SET_SRC was!  Is the 
SET_DEST supposed to be FIRST_STACK_REG, or a plain REG or MEM?