Qualified lookup through using declarations.  Diagnose a new type of ambiguity.
Split the various ambiguous result enumerators into their own enum.  Tests
for most of C++ [namespace.qual].



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83700 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed