gdb/

gdb/
	* std-operator.def: Remove OP_BITSTRING.
	* breakpoint.c (watchpoint_exp_is_const): Update.
	* eval.c (evaluate_subexp_standard): Remove handling to
	OP_BITSTRING.
	* expprint.c (print_subexp_standard): Likewise.
	(dump_subexp_body_standard): Likewise.
	* parse.c (operator_length_standard): Likewise.
	* valops.c (value_bitstring): Remove.
	* value.h: Remove the declaration of 'value_bitstring'.