* pa.c (pa_adjust_insn_length): Rewrite so that it only adjusts
insns which really need adjustment.
(output_cbranch): Rework so that output templates are simpler.
Use shorter sequence for long backwards conditional branches with
a filled delay slot that is nullified. More agressively use "skip"
instructions. More agressively nullify the delay slot if nothing
useful could be placed there.
(output_bb): Likewise.
(forward_branch_p): New function.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@4875 138bc75d-0d04-0410-961f-82ee72b054a4