This allows Torque code to refer to these bitfields (not currently
relevant for any of these classes), and allows the postmortem debugging
API to provide details about these bitfields.

Change-Id: I79c74a3c5ef1f77e839720a4e8ee1f8482a576ca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2049870
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66471}