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Without them, GDB doesn't work to debug Emacs, since the AIX linker
optimizes away the relevant external symbols.  Use enums instead;
this suffices for the AIX port, which is 32-bit-only anyway.
* lisp.h (ENUMABLE, DEFINE_GDB_SYMBOL_ENUM): New macros.
(ARRAY_MARK_FLAG, PSEUDOVECTOR_FLAG, VALMASK): Use them.
(ARRAY_MARK_FLAG_val, PSEUDOVECTOR_FLAG_val, VALMASK_val):
New macros.