[cfe-commits] PATCH: Fix PR5751 by looking through using decls during overload resolution

[Chandler Carruth]

Attached is a patch that seems to fix PR5751 by looking through using
decls when resolving overloaded candidate functions. Does this look
correct? Should this perhaps be factored into UnresolvedLookupExpr? In
ResolveAddressOfOverloadedFunction, I'm applying the logic even for
member functions, is that correct?

Also, this includes a test case more specifically targeted at overload
resolution rather than templates. Would it be useful to include
template-specific test case here or is that covered elsewhere? And is
using-decl-1 the correct place to put the test case? I remember Chris
indicating he wanted fewer files and longer tests these days...
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