dwarf2out.c (dwarf2out_begin_prologue): Rename IA64_UNWIND_INFO to TARGET_UNWIND_INFO.

dwarf2out.c (dwarf2out_begin_prologue): Rename IA64_UNWIND_INFO to TARGET_UNWIND_INFO.

	* dwarf2out.c (dwarf2out_begin_prologue): Rename IA64_UNWIND_INFO
	to TARGET_UNWIND_INFO.
	* except.c (output_function_exception_table): Ditto.
	* except.h: Ditto.
	* opts.c (decode_options): Ditto.
	* passes.c (rest_of_handle_final): Ditto.
	* final.c (final_start_function): Ditto.
	(final_scan_insn, final_scan_insn): Replace IA64_UNWIND_EMIT with
	target hook.
	* targhooks.h (default_unwind_emit): Declare.
	* targhooks.c (default_unwind_emit): New function.
	* target-def.h: Define and use TARGET_UNWIND_EMIT.
	* target.h (struct gcc_target): Add unwind_emit.
	* config/ia64/ia64.c (TARGET_UNWIND_EMIT): Define.
	* config/ia64/ia64.h: Rename IA64_UNWIND_INFO to TARGET_UNWIND_INFO.
	Remove IA64_UNWIND_EMIT.
	* doc/tm.texi: Document TARGET_UNWIND_EMIT and TARGET_UNWIND_INFO.

From-SVN: r84734