h8300-protos.h: Add a prototype for h8300_shift_needs_scratch_p.
* config/h8300/h8300-protos.h: Add a prototype for h8300_shift_needs_scratch_p. * config/h8300/h8300.c (h8300_shift_needs_scratch_p): New. * config/h8300/h8300.h (OK_FOR_R): New. (OK_FOR_S): Likewise. (OK_FOR_T): Likewise. (EXTRA_CONSTRAINT): Call OK_FOR_R, OK_FOR_S, and OK_FOR_T. * config/h8300/h8300.md (anonymous shift patterns): Use constraints R, S, and T. From-SVN: r54143
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