1.0.28.41: make MAKE-ARRAY transforms co-operate with FILL better

1.0.28.41: make MAKE-ARRAY transforms co-operate with FILL better

  When the transform for FILL fires, and the type of initial-element
  has not yet been propagated, so VECTOR-FILL* fires instead of a more
  specific transform (which currently exist only for
  SIMPLE-BASE-STRINGs and SIMPLE-BIT-VECTORs.)

  Annotate the type with THE and the SAETP-SPECIFIER so the most
  specific transform can fire.

  Reported by Stas Boukarev.