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	file_start_file_directive): New hooks.
	* target-def.h (TARGET_ASM_FILE_START_FILE_DIRECTIVE,
	TARGET_ASM_FILE_START_APP_OFF, TARGET_ASM_FILE_START):
	New hook-definition macros.
	* doc/tm.texi: Document new hooks; remove docs of ASM_FILE_START.
	* varasm.c (default_file_start): New.
	* output.h: Prototype it.
	* toplev.c (init_asm_output): Use targetm.asm_out.file_start.
	* system.h: Poison ASM_FILE_START.

	* config/alpha/alpha.c (alpha_write_verstamp): Delete.
	(alpha_file_start): New, define if !TARGET_ABI_UNICOSMK.
	(unicosmk_asm_file_start): Rename unicosmk_file_start,
	make static, take no arguments.
	(TARGET_ASM_FILE_START, TARGET_ASM_FILE_END,
	TARGET_ASM_FILE_START_FILE_DIRECTIVE): Set as appropriate.
	* config/alpha/unicosmk.h: Don't define ASM_FILE_START nor
	TARGET_ASM_FILE_END.  Remove reference to ASM_FILE_START in
	comment.
	* config/arc/arc.c (arc_asm_file_start): Rename
	arc_file_start, take no arguments, make static.
	(TARGET_ASM_FILE...