[CVS 980326]: Bug in haifa scheduler on sparc-sun-solaris2.5.1

[Jeffrey A Law]

  In message < 199804070046.RAA11010@rtl.cygnus.com >you write:
  > The problem here is that combine simplified a conditional branch into an
  > unconditional branch, causing the immediately following loop to become
  > unreachable.
Ah.

  > Haifa-sched's code for detecting unreachable blocks doesn't
  > work in the presense of unreachable loops.  It is trivial to patch this
  > for now, but I think we need something stronger long term.
Sounds like we need to do a standard reachability check.  I'll put it
on the todo list.  Shouldn't be too hard.

jeff