* combine.c (struct insn_link): New field `regno'.
(alloc_insn_link): New parameter `regno'. Use it.
(find_single_use): Check the new field.
(can_combine_def_p, can_combine_use_p): New functions. Split
off from ...
(create_log_links): ... here. Correct data type of `regno'.
Adjust call to alloc_insn_link.
(adjust_for_new_dest): Find regno, use it in call to
alloc_insn_link.
(try_combine): Check reg_used_between_p when combining a PARALLEL
as earlier insn. Adjust call to alloc_insn_link.
(distribute_links): Check the new field.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218241 138bc75d-0d04-0410-961f-82ee72b054a4