(zero_extendqidi2): Handle TARGET_BYTE_OPS.

(zero_extendqidi2): Handle TARGET_BYTE_OPS.

(zero_extendhidi2): Likewise.
(zero_extendqisi2): Likewise.
(zero_extendhisi2): Likewise.
(extendqisi2): Use extendqidi2x if TARGET_BYTE_OPS.
(extendqidi2): Likewise.
(extendqidi2x): New pattern.
(extendhisi2): Use extendhidi2x if TARGET_BYTE_OPS.
(extendhidi2): Likewise.
(extendhidi2x): New pattern.
(movhi): Handle TARGET_BYTE_OPS.
(movhi matcher): Output ldwu and stw.
(movqi): Handle TARGET_BYTE_OPS.
(movqi matcher): Output ldbu and stb.

From-SVN: r13149