Functions renamed from registers_ok_for_ldd and
memory_ok_for_ldd repectively.  All callers changed.
(register_ok_for_ldd): New function to determine if a register
is a pseudo or the first register in a hard register pair.
(mem_aligned_8): No longer static.  Return 0 instead of aborting
when presented with an rtx which is not a MEM.
(eligible_for_epilogue_delay): Use in_uncond_branch_delay since this
is an unconditional branch.

From-SVN: r1662