* dbxout.c (dbxout_really_begin_function): Rename to
	dbxout_begin_function.
	(dbx_debug_hooks, xcoff_debug_hooks): Update.
	(dbxout_begin_function): Remove.
	(dbxout_function): Update.
	(dbxout_source_line): Update prototype.
	* dbxout.h (dbxout_begin_function): Remove.
	* debug.c (do_nothing_debug_hooks): Update.
	(debug_nothing_tree): Update.
	(debug_nothing_charstar_rtx): Remove.
	* debug.h (union tree_node): Declare.
	(struct rtx_def): Remove.
	(gcc_debug_hooks): New hooks begin_prologue, end_prologue,
	begin_function.  Change source_line prototype.
	(debug_nothing_tree): New.
	(debug_nothing_charstar_rtx): Delete.
	(dwarf2out_begin_prologue): Moved from ...
	* tree.h: ... here.
	* dwarf2out.c (dwarf2_debug_hooks): Update.
	(dwarf2out_begin_prologue): Update prototype.  If genuine dwarf2
	debug info, call dwarf2out_source_line.
	(dwarf2out_souce_line): Update prototype.
	* dwarfout.c (dwarfout_begin_function): Rename dwarfout_end_prologue.
	Change prototype, make static.
	(dwarfout_source_line): Update prototype.
	(dwarf_debug_hooks): Update.
	* dwarfout.h (dwarfout_begin_function): Remove.
	* final.c (final_start_function, final_scan_insn): Use appropriate
	debug hooks, update to use notice_source_line.
	(output_source_line): Rename notice_source_line.  Don't call the
	source_line debug hook.
	* sdbout.c (sdbout_begin_function): Rename sdbout_begin_prologue,
	make static, update prototype.
	(sdbout_mark_begin_function): Rename sdbout_begin_function, update
	prototype.
	(sdbout_end_prologue): New.
	(sdbout_source_line): Update prototype.
	(sdbout_debug_hooks): Update.
	(sdbout_symbol): Remove unused var.
	* sdbout.h (sdbout_begin_function, sdbout_mark_begin_function):
	Delete.
	* varasm.c: Include debug.h.
	(assemble_start_function): Use begin_function debug_hook.
	* xcoffout.c (xcoffout_begin_prologue): Rename xcoffout_begin_function,
	update with prototype.
	(xcoffout_source_line): Update prototype.
	* xcoffout.h (xcoffout_begin_prologue): Rename xcoffout_begin_function,
	update prototype.
	(xcoffout_source_line): Update prototype.

From-SVN: r44087