It seems the current practice of copying flags into allow_ fields began
around https://codereview.chromium.org/13450007. That's also when
cctest/test-parsing was updated to have a set of flags for parser testing.

My question is this: is there any concrete reason that we need separate
fields for these, rather than simply accessing the FLAGs directly in the
parser?

Asking because a new contributor asked me on irc, and I couldn't come up
with a good reason (I'd thought it might have something to do with
threading, since the parser can run off the main thread, but that doesn't
seem to be the case, since we do access some flags in the parser).

- Adam

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