optabs.h (optab_handlers): Change type of insn_code to int.

optabs.h (optab_handlers): Change type of insn_code to int.

gcc/
	* optabs.h (optab_handlers): Change type of insn_code to int.
	(optab_handler, set_optab_handler, convert_optab_handler)
	(set_convert_optab_handler): Treat the insn_code field as "insn_code -
	CODE_FOR_nothing".
	* optabs.c (optab_table, convert_optab_table): Always zero-initialize.
	(init_insn_codes): Zero both the above arrays.
	(init_optabs): Never call init_insn_codes first time around.

From-SVN: r161809