dwarf2/ACCUMULATE_OUTGOING_ARGS fix

[Jeffrey A Law]

  In message < 20010102200705.H6101@atrey.karlin.mff.cuni.cz >you write:
  > Hi
  > The final.c assumes that ACCUMULATE_OUTGOING_ARGS hosts never modify
  > stack pointer in the function body.  This is not quite true for i386
  > that may call pascal functions and modify stack pointer in few
  > other cases as well.
Under precisely what conditions can code still modify the stack pointer
when ACCUMULATE_OUTGOING_ARGS is true?  And I'm curious why calling pascal
routines requires modification of the stack pointer.

jeff