PR middle-end/33335
	* optabs.h (optab_table): Change type to struct optab from optab.
	(convert_optab_table): Similarly.
	Adjust all _optab macros to expand to addresses of optab_table
	resp. convert_optab_table elements rather than the values of the
	elements.
	* optabs.c (optab_table): Change typype to struct optab from optab.
	If compiled by recent GCC, initialize all the insn_code fields in
	the array using designated range initializers.
	(convert_optab_table): Similarly.
	(convert_optab_libfunc, optab_libfunc, set_optab_libfunc,
	set_conv_libfunc): Into libfunc_entry's optab field store index within
	optab_table resp. convert_optab_table array instead of difference
	between two separately malloced addresses.
	(new_optab): Add op argument, don't return anything.  Initialize
	just the insn_code field in handlers array and only when needed.
	(init_optab, init_optabv): Add op argument, don't return anything.
	Adjust new_optab caller.
	(new_convert_optab): Removed.
	(init_convert_optab): Add op argument, don't return anything, don't
	call new_convert_optab.  If needed, initialize insn_code field in
	handlers array.
	(init_optabs): Adjust init_optab, init_optabv and init_convert_optab
	callers.
	(debug_optab_libfuncs): Adjust uses of optab_table and
	convert_optab_table arrays.

From-SVN: r130274