This change will enable basic "goto definition" support in the upcoming
Torque language server.

R=tebbi@chromium.org

Bug: v8:7793
Change-Id: I8e50cc58288991a2f6024d06bf38f4fd66f21eea
Reviewed-on: https://chromium-review.googlesource.com/c/1477055
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59694}