We often need to create a {Vector} view of data owned by a container
like {std::vector}. The canonical way to do this is this:
Vector<T>{vec.data(), vec.size()}

This pattern is repeating information which can be deduced
automatically, like the type T.

This CL introduces a {VectorOf} helper which can construct a {Vector}
for any container providing a {data()} and {size()} accessor, and uses
it to replace the pattern above.

R=ishell@chromium.org

Bug: v8:8238
Change-Id: Ib3a11662acc82cb83f2b4afd07ba88e579d71dba
Reviewed-on: https://chromium-review.googlesource.com/c/1337584Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57538}