[cfe-commits] patch: improve two-phase lookup failure diagnostic

[Nick Lewycky]

Clang has a nice diagnostic for failing two-phase name lookup which will,
when appropriate, suggest moving a function into one of the associated
namespaces. It's smart enough to filter out namespace 'std', and this patch
adds filtering for names with '__' anywhere in them. This is good for us
libstdc++ users who find that lots of standard types are associated with
__gnu_cxx.

Please review!

Nick
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