gstab.h (stab_code_type): Define, to be used instead of the __stab_debug_code enum, made anonymous.

	* gstab.h (stab_code_type): Define, to be used instead of the
	__stab_debug_code enum, made anonymous.  Add 2009 to the copyright
	notice.
	* dbxout.c (STAB_CODE_TYPE): Remove #define and replace use
	occurrences by stab_code_type.
	* mips-tfile.c (STAB_CODE_TYPE): Remove #define, unused.

From-SVN: r147734