The Torque compiler generates macros for accessing fields in classes.
These are currently indistiguishable from user defined macros. To
improve the upcoming symbol search in the Torque Language Server, this
CL introduces a flag on macros to differentiate user defined and auto
generated macros.

R=sigurds@chromium.org

Bug: v8:7793
Change-Id: I84a8ab14535ec779494b5b2e887fda8fc4edf3e5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1598688Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61261}