configure.in (ENUM_BITFIELDS_ARE_UNSIGNED): Added.
* configure.in (ENUM_BITFIELDS_ARE_UNSIGNED): Added. Check that
bitfields of the host compiler are not signed quantities.
* config.in: Regenerate.
* configure: Regenerate.
* system.h (USE_ENUM_BITFIELDS): Added.
(ENUM_BITFIELDS): Added.
* rtl.h (rtx_def): Members `code', `mode', now ENUM_BITFIELD.
(SHORT_ENUM_BUG): Deleted.
* tree.h (tree_common): Members `code', `mode', `built_in_class',
now ENUM_BITFIELD.
* config/i386/xm-sco.h (ONLY_INT_FIELDS): Deleted.
(CODE_FIELD_BUG): Likewise.
* config/m68k/x-apollo68 (CC): Deleted SHORT_ENUM_BUG.
(OLD_CC): Likewise.
* config/m68k/x-ccur (X_CFLAGS): Likewise.
From-SVN: r33233