vector-ref and vector-set! now have opcodes

vector-ref and vector-set! now have opcodes

* module/language/tree-il/primitives.scm
  (*interesting-primitive-names*): Resolve vector-ref and vector-set!.

* module/language/tree-il/compile-glil.scm (*primcall-ops*): And compile
  vector-ref and vector-set! to their opcodes.

* libguile/vm-i-scheme.c (vector-ref, vector-set): New opcodes, placed
  before the bytevector ops. The renumbering shouldn't affect anyone,
  given that the bytevector ops were not yet used. Fix a few bugs in the
  bytevector ops.