"set record instruction-history-size"/"set record function-call-history-size" range...

"set record instruction-history-size"/"set record function-call-history-size" range validation.

While the commands are uinteger, the target interfaces are limited to
INT_MAX.  Don't let the user request more than we can handle.

gdb/
2013-03-26  Pedro Alves  <palves@redhat.com>

	* record.c (record_insn_history_size_setshow_var)
	(record_call_history_size_setshow_var): New globals.
	(command_size_to_target_size): New function.
	(cmd_record_insn_history, cmd_record_call_history): Use
	command_size_to_target_size instead of cast.
	(validate_history_size, set_record_insn_history_size)
	(set_record_call_history_size): New functions.
	(_initialize_record): Install set_record_insn_history_size and
	set_record_call_history_size as "set" hooks of "set record
	instruction-history-size" and "set record
	function-call-history-size".