Refactor the checking for explicit template instantiations being performed in
the right namespace in C++11 mode. Teach the code to prefer the 'must be in
precisely this namespace' diagnostic whenever that's true, and fix a defect
which resulted in the -Wc++11-compat warning in C++98 mode sometimes being
omitted.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142329 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed