* gdbarch.sh: Explictly specify all method levels. When a
variable with an empty level, provide a non-multi-arch default.
(BELIEVE_PCC_PROMOTION_TYPE): Set level to empty.
* gdbarch.h: Re-generate.
* stabsread.c (BELIEVE_PCC_PROMOTION_TYPE): Delete. Always defined.
* config/m68k/tm-sun3.h (BELIEVE_PCC_PROMOTION_TYPE): Define as 1