The test now verifies that JavaScript programs can be executed
over the REPRL interface, that runtime exceptions can be detected,
and that the engine's state is properly reset between executions.

Change-Id: Ic8032c07e222307cbb4d332e7eaec61936a10ccd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2396082Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Samuel Groß <saelo@google.com>
Cr-Commit-Position: refs/heads/master@{#69883}