This CL changes how the start and end address for the iteration are
retrieved from an std::vector that won't cause a failed assertion.

There are some std::vector implementations that contain bounds checks.
The string table iteration code uses an access like
{&young_strings_[young_strings_.size()]} to retrieve the end address
for an iteration. This results in a out of bounds exception on such a
std::vector implementation even though the "element" itself is not actually
accessed.

Change-Id: I31db8994a7ff613897ad9deac953a1ee91f322b3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1704097Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62742}