regno_reg_rtx and related macros

[Richard Kenner]

    Yup.  And, the old way meant that working on the code required you to
    know more: namely the variables and the places in various structs
    where they were squirrelled away as we switched between functions.

No, you didn't need to "know" that since you could just look at what's
in the source and pass that to the debugger.

    I agree with Bernd; expanding the macros in the source is probably an
    improvement.  Then you can cut-and-paste things again.  Of course, the
    things will be longer.

Right and *that* has a cleanliness impact!