* h8300.h (UNOP3): Mark the register operand in this insn
as a source operand, not a destination operand.
(SHIFT_2, SHIFT_IMM): Remove. Eliminate all references.
(UNOP3): Change SHIFT_IMM to IMM for H8/S bitops. Mark
register operand with SRC_IN_DST.
More hackery for new shift ops on the H8/S.