1.0.6.45: fix compilation speed regression from DATA-VECTOR-REF-WITH-OFFSET

1.0.6.45: fix compilation speed regression from DATA-VECTOR-REF-WITH-OFFSET

	* Change the remaining x86oid DATA-VECTOR-REF VOPs to
          DATA-VECTOR-REF-WITH-OFFSETs. The VOPs only accept an offset of
          0, and are thus functionally identical to the old ones.
        * This allows replacing the conditional deftransform from D-V-R to
          D-V-R-W-O with an unconditional source-transform.
        * Rewrite transformations with (OR (SIMPLE-UNBOXED-ARRAY (*))
          SIMPLE-VECTOR) argument types to instead do the type tests in the
          body of the transform, since the test can be expressed
          in a cheaper way in the latter case.