patch to handle i386 stack alignment using PREFERRED_STACK_BOUNDARY

[Jeffrey A Law]

  In message < 199903240236.VAA09548@jwlab.FEITH.COM >you write:
  > Did you run any integer only benchmarks?  They showed no regression?
  > I just wasn't sure what was covered in "... every benchmark was as
  > good ...".  :-)
FP only.  Just ran specint92 -- no signficant change in either
direction.  Not a huge suprise.

jeff