[diagnostic patch] PR 54941

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi all, Gaby,

in this bug Manuel noticed that the zeros in the diagnostic lines of the 
form:

<built-in>:0:0: ....

don't provide useful information. Thus the below just avoids printing 
the zeros basing directly on the file name: admittedly, it may seem a 
bit gross, but in practice the strcmp would often fail early, and should 
be rather efficient anyway because the second argument is known at 
compile-time.

Tested x86_64-linux.

Thanks,
Paolo.

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