[C++ Patch] PR 53158 (EXPR_LOC_OR_HERE version)

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

Hi again,

thus the below is what I booted and tested. As you can see I had to 
tweak a bit an existing testcase, for which the location is now a bit 
"smaller", 3 chars, in fact is still not perfect, but arguably a tad 
better. Otherwise no issues. Ah, I'm touching also a c-common.c 
function, in fact all the other warning* functions in the same file 
already use the EXPR_LOC_OR_HERE on the expr argument idea.

Tested x86_64-linux.

Thanks,
Paolo.

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