[C++ Patch] PR 52174 aka DR 1423

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

Hi,

implementing the resolution seems rather straightforward, just check 
LOOKUP_ONLYCONVERTING in standard_conversion. However, while playing 
with some additional tests outside bug & testsuite (similar to 
nullptr32.C), I noticed a latent issue: in case of base initializers we 
were setting anyway LOOKUP_ONLYCONVERTING in add_function_candidate (the 
other cases listed in 8.5/16 are handled elsewhere and seem all fine). 
Thus the rather ad-hoc-ish tweak there: I spent some time on it and 
couldn't find anything reasonably simple & better, appears to work 
anyway, for templates too.

Tested x86_64-linux.

Thanks,
Paolo.

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