* regrename.h: New file.
	* regrename.c: Include it.  Also include "emit-rtl.h".
	(struct du_head, struct du_chain, du_head_p DEF_VEC and
	DEF_VEC_ALLOC_P): Move to regrename.h.
	(do_replace): Remove declaration.
	(insn_rr): New variable.
	(cur_operand): New static variable.
	(regrename_chain_from_id): Renamed from chain_from_id and no longer
	static.  All callers changed.
	(record_operand_use): New static function.
	(scan_rtx_reg): Use it.
	(find_best_rename_reg): New function, broken out of rename_chains.
	(rename_chains): Use it.  Don't update chain regno and nregs here, ...
	(regrename_do_replace): ... do it here instead.  Renamed from
	do_replace, and no longer static.  All callers changed.
	(regrename_analyze): No longer static.  New arg bb_mask.
	All callers changed.  If bb_mask is nonzero, use it to limit the
	number of basic blocks we analyze.  If we failed to analyze a block,
	clear insn operand data.
	(record_out_operands): New arg insn_info.  Update cur_operand if it is
	nonnull.
	(build_def_use): If insn_rr is nonnull, pass an insn_info to
	record_out_operands, and update cur_operand here as well.
	(regrename_init, regrename_finish): New functions.
	(regrename_optimize): Use them.
	* Makefile.in (regrename.o): Adjust dependencies.

From-SVN: r180198