re PR fortran/87919 (Incorrect fortran handling of -fno-* options)

re PR fortran/87919 (Incorrect fortran handling of -fno-* options)

	PR fortran/87919
	* options.c (SET_FLAG, SET_BITFLAG, SET_BITFLAG2): New macros.
	(set_dec_flags): Set/unset DEC and std flags according to value.
	(post_dec_flags, set_init_local_zero): New functions.
	(gfc_init_options): Use set_init_local_zero and post_dec_flags.
	(gfc_handle_options) <case OPT_fcheck_array_temporaries>: Use
	SET_BITFLAG.
	<case OPT_finit_local_zero>: Use set_init_local_zero.
	<case OPT_fdec>: Pass value to set_dec_flags.
	<case OPT_fdec_structure>: Remove.

Co-Authored-By: Mark Eggleston <mark.eggleston@codethink.co.uk>
From-SVN: r266761