bug#28349: 26.0.50; compilation mode syntax highlighting incorrect

[Eli Zaretskii]

> From: Richard Copley <rcopley@gmail.com>
> Date: Mon, 4 Sep 2017 20:21:32 +0100
> 
> There seems to be an issue with compilation-mode highlighting in
> recent Emacs master. Not all lines that match the regexp alist
> are highlighted. See attached screenshot for an example.
> The "checking" lines are highlighted more or less at random.
> There are errors from jit-lock (see below).
> 
> In GNU Emacs 26.0.50 (build 2, x86_64-w64-mingw32)
>  of 2017-09-02 built on MACHINE
> Repository revision: f2a074830c588d2a1c240afbd709a029a4c1a42f
> Windowing system distributor 'Microsoft Corp.', version 10.0.15063
> Recent messages:
> Error during redisplay: (jit-lock-function 2553) signaled
> (void-function compilation-face)

This is because Tom's changes in 846870e removed the function
compilation-face, which is still referenced in several places in
compile.el.

Tom, could you take a look, please?

Thanks.