Since {Handle<T>::location()} just returns the value of
{HandleBase::location()}, we can just publicly expose the latter and
save some compile time and object file size.

R=jkummerow@chromium.org

Bug: v8:9183
Change-Id: I9cddba2c9f8b097c26cf1a4e7dbfbe72b03d79c2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1624211
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61737}