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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: eval-when-compile vs defconst
Date: Tue, 14 Nov 2006 07:27:05 -0500
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Xref: news.gmane.org gmane.emacs.devel:62298
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    Surely it's there to avoid calling (and loading) `regexp-opt' at load
    time, and the concat is merely along for the ride?  Unless the optimizer
    already evaluates calls to `regexp-opt' on quoted lists, it seems useful
    to me.

Indeed, to avoid loading regexp-opt might be worth the trouble.
(The time of running it isn't significant.)

So if it succeeds in doing that, it is worth keeping.