alpha haifa regression

[Jeffrey A Law]

  In message < 199710072139.WAA15411@phal.cygnus.co.uk >you write:
  > But for ports where the arguments are set up with __builtin_saveregs -
  > expanded from va_start - this would require two blockage insns - one
  > in front and one at the end - which could end up in an advanced position
  > in the function too.
No.  You only need once since the prologue itself won't load/store in
the same area as the varargs flushback.  And if there is some el-bizzaro
target that does, then emit two blockages.  No big deal.

jeff