cobol: Refactored variable creation.

When I started work on code generation for COBOL <mumble> years ago,
creating variables was one of the very first things I had to figure out
how to do.  That resulted in me doing things that I, now older and wiser
and more knowledgeable (well, older, anyway), realize were unnecessary
and unhelpful.

Mainly: I have a utility gg_define_variable(tree type).  I originally
created many helper routines that this patch eliminates in favor of
calling that routine with the type explicitly mentioned.

gcc/cobol/ChangeLog:

	* cdf.y: Changes in support of CDF parsing.
	* compare.cc (total_digits_tree): Use gg_define_variable().
	(alpha_compare_figconst): Likewise.
	(alpha_compare): Likewise.
	(numeric_alpha_compare): Likewise.
	(addr_of_compare): Likewise.
	(compare_class): Likewise.
	* genapi.cc (create_cblc_string_variable): Formatting.
	(initialize_variable_internal): Use gg_define_variable().
	(enter_program_common): Likewise.
	(parser_accept): Likewise.
	(parser_display): Likewise.
	(parser_exhibit): Likewise.
	(parser_assign): Likewise.
	(parser_xml_parse): Likewise.
	(establish_using): Likewise.
	(parser_division): Likewise.
	(parser_file_open): Likewise.
	(parser_file_delete_file): Likewise.
	(inspect_tally): Likewise.
	(inspect_replacing): Likewise.
	(parser_unstring): Likewise.
	(parser_string): Likewise.
	(create_and_call): Likewise.
	(hijack_for_development):  Likewise.
	* gengen.cc (gg_declare_variable): Clean up comments.  Early return
	when "already_defined".  Clean up VAR_DECL attributes.
	(gg_define_variable): Clean up how gg_declare_variable is used.
	(gg_define_volatile_variable): Eliminate.
	(gg_define_bool): Eliminate.
	(gg_define_char): Eliminate.
	(gg_define_uchar): Eliminate.
	(gg_define_int): Eliminate.
	(gg_define_size_t): Eliminate.
	(gg_define_int128): Eliminate.
	(gg_define_char_star): Eliminate.
	(gg_define_uchar_star): Eliminate.
	(gg_define_void_star): Eliminate.
	(gg_define_longdouble): Eliminate.
	(gg_fprintf): Use gg_define_variable().
	(gg_read): Likewise.
	(gg_memdup): Likewise.
	* gengen.h (enum gg_variable_scope_t): Eliminate vs_file.
	(gg_define_variable): New overloaded declaration.
	(gg_define_volatile_variable): Eliminate.
	(gg_define_bool): Eliminate.
	(gg_define_char): Eliminate.
	(gg_define_uchar): Eliminate.
	(gg_define_int): Eliminate.
	(gg_define_size_t): Eliminate.
	(gg_define_int128): Eliminate.
	(gg_define_longdouble): Eliminate.
	(gg_define_void_star): Eliminate.
	(gg_define_char_star): Eliminate.
	(gg_define_uchar_star): Eliminate.
	(gg_get_address_of): Formatting.
	* genmath.cc (set_up_compute_error_label): Use gg_define_variable().
	(add_litN_to_numdisp): Likewise.
	* lexio.cc (skip_quoted_literal): Eliminate.
	(remove_inline_comment): Change the algorithm.
	* parse.y: CDF processing changes.
	* scan.l: Likewise.
	* scan_ante.h (yyinput): Likewise.
	(yyunput): Likewise.
	(skip_string): Likewise.
	(is_refmod): Likewise.
	* show_parse.h (TRACE1_INDENT): Use gg_define_variable().
	* structs.cc: Change comment.
	* token_names.h: Updated for CDF changes.