Tail calls are connected to the end of the graph, so technically they
also constitute loop exits.
Additional Changes:
- In DoReturnCall, change the argument {Node* index_node} into
  {Value index_or_caller_value}.
- Rename StackValueVector -> ValueVector.
- Add a test that reveals the bug.

Bug: chromium:1183622, v8:11298
Change-Id: I58f7877f2d03e94f6a281e566829897c3000b890
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2727503Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73135}