bug#19669: 25.0.50; c-mode: incorrect fontification of simple enums

[Dima Kogan <dima@secretsauce.net>]

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Hi. I'm running a very recent build of emacs from git revision 253d44b
(2015/01/08). I'm loading a very simple C file that has some enums
defined (attached). The enum elements all should have been rendered with

 font-lock-variable-name-face

However at startup with

 emacs -Q -nw

only some of the elements get this face; many have just the default
face. Pressing M-x changes things: some elements actually lose the
correct face. In general, using emacs tends to change what is or isn't
rendered properly. I'm attaching screenshots of the state at startup and
after M-x.

This is 100% reproducible on my end.



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enum xxx_xxxxxxxxxx_x
    {XXX_XXXX_XXXX_XXXXX_XXXXX,
     XXX_XXXX_XXXX_XXXXX_XXXXX,
     XXX_XXXX_XXXXXX_XXXXXXXX_XXXXXXX,
     XXX_XXXX_XXXXXX_XXXXXXXX_XXXXXXX,
     XXX_XXXX_XXXX_XXXXXXXX,
     XXXXXX_XXXXXXX_XXXX_XXXXXXXX,
     XXXXX_XXXXXX_XXXX_XXXXXXXX,
     XXX_XXXXXXX,
     XXX_XXX_XXXXXXXX,
     XXX_XXX_XXX_XXXXXXXXX,
     XXXXXX_XXX_XXXXXXX,
     X_XXXXXXXXXX};

enum xxx_xxxx_xxxxxxxxxx_x
    {XXX_XXXXXX_XXXX_XXX,
     XXX_XXXXXX_XXXX_XX,
     XXX_XXXXXXXX_XXXX_XXX,
     XXX_XXXX_XXXXXXX,
     XXX_XX_XXXXX_XXXX_XXXXXXX,
     XXXXXX_XXXXXX_XXXX_XXXXXXXX,
     XXX_XXXX_XXXXXXX,

     // xxx
     XXXXXX_XXXXXXXX};

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