When generating getters, Torque needs to decide whether to perform a
normal or relaxed load. Thus far, it has used the somewhat non-obvious
logic that any indexed field with tagged non-smi data gets relaxed
loads. This change adds a new annotation @relaxedRead to be consistent
with the existing @relaxedWrite annotation. I added @relaxedRead
annotations on any field that previously had this automatic behavior and
whose getter is called, except for those in ScopeInfo because I'm
relatively confident that it doesn't need relaxed access.

Bug: v8:7793
Change-Id: I9987eea13760b967f1b8a3189b69742e55140c30
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2600113
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72499}