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This undoes part of the 2012-11-03 changes.  Some people build
with plain -g rather than with -g3, and they need the duplicate
definitions for .gdbinit to work; see <http://bugs.gnu.org/12814#26>.
* lisp.h (GCTYPEBITS, ARRAY_MARK_FLAG, PSEUDOVECTOR_FLAG, VALMASK):
Define as macros, as well as as enums or as constants.