ACCUMULATE_OUTGOING_ARGS as runtime argument take 2

[Jeffrey A Law]

  In message < 20000329114945.D28624@atrey.karlin.mff.cuni.cz >you write:
  > Is there some so weird port needing to change this definitions at runtime?
  > I remember seeing some note about this on HP-PA with ARGS_* macro.
The direction of argument growth (not stack growth) can vary on the PA
depending on the ABI in use.

jeff