gas local label and dollar label handling

gas local label and dollar label handling

Much of the gas source and older BFD source use "long" for function
parameters and variables, when other types would be more appropriate.
This patch fixes one of those cases.  Dollar labels and numeric local
labels do not need large numbers.  Small positive itegers are usually
all that is required.  Due to allowing longs, it was possible for
fb_label_name and dollar_label_name to overflow their buffers.

	* symbols.c: Delete unnecessary forward declarations.
	(dollar_labels, dollar_label_instances): Use unsigned int.
	(dollar_label_defined, dollar_label_instance): Likewise.
	(define_dollar_label): Likewise.
	(fb_low_counter, fb_labels, fb_label_instances): Likewise.
	(fb_label_instance_inc, fb_label_instance): Likewise.
	(fb_label_count, fb_label_max): Make them size_t.
	(dollar_label_name, fb_label_name): Rewrite using sprintf.
	* symbols.h (dollar_label_defined): Update prototype.
	(define_dollar_label, dollar_label_name): Likewise.
	(fb_label_instance_inc, fb_label_name): Likewise.
	* config/bfin-lex.l (yylex): Remove unnecessary casts.
	* expr.c (integer_constant): Likewise.
	* read.c (read_a_source_file): Limit numeric label range to int.