mn10300 register numbering in debugging info

[Alexandre Oliva]

In late August, 2000, we noticed there was a mismatch between the
register numbering emitted by GCC in debugging info and the register
numbering expected by GDB.  It was decided that the best course of
action was to adjust GCC, since it had never been right in the first
place.  Matsushita disagreed, since their own debugger already used
the debugging info as we used to emit, and they've asked us to revert
to the original numbering, and fix GDB instead.  So, I'm reverting the
patch I checked in on August 26, 2000.  While I was at it, I found an
unrelated small formatting change in my local tree, and decided to
check it in along with it.  Mainline and 3.0 branch.

A patch for GDB so that it matches GCC's register numbering is still
under development, but I wanted to check this in as soon as possible,
to not take the risk of a GCC 3.0 freeze or something.