Try to complete a type before looking for conversion functions within
that type. Note that we do not produce a diagnostic if the type is
incomplete; rather, we just don't look for conversion functions. Fixes PR4660.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@79919 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed