This CL adds navigation support for labels listed in the "otherwise"
part of a call expression. There are two places where a definition for
such a label can be found:
  - The signature of the current macro (caller)
  - A label block of a "try" statement that surrounds the call
    expression.

R=tebbi@chromium.org

Bug: v8:8880
Change-Id: If8849ad29abcf94f301d7a51e3e52c5517601bc0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1593295
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61228}