* h8300.c (two_insn_adds_subs_operand): Fix a typo.
        * h8300.h (OK_FOR_T): New.
        (EXTRA_CONSTRAINT): Support OK_FOR_T.
        * h8300.md: Use inc/dec.[wl] for increment/decrement
        by 1 and 2 in HI and SI modes.

From-SVN: r35155