bug#13369: 24.1; compile message parsing slow because of omake hack

[Glenn Morris]

Mattias Engdegård wrote:

> Here are the times, in seconds, for executing compilation-parse-errors
> far down a large compile buffer (5000 lines, or about 440 KiB),
> with and without omake present in compilation-error-regexp-alist:
>
> omake
> present    absent
> 30.3        3.2     Standard code
>  6.5        3.2     repaired regexp (escaped ^)
>  3.2        3.2     COND expression removed

Thanks. Could you also give the numbers for
compilation-error-regexp-alist containing only `gnu' (assuming that is
the one that is relevant for your test case)?