Check that template template arguments match template template parameters

properly even when a non-type template parameter has a dependent type.

Previously, if a non-type template parameter was dependent, but not dependent
on an outer level of template parameter, we would not match the type of the
parameter. Under [temp.arg.template], we are supposed to check that the types
are equivalent, which means checking for syntactic equivalence in the dependent
case.

This also fixes some accepts-invalids when passing templates with auto-typed
non-type template parameters as template template arguments.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@291512 91177308-0d34-0410-b5e6-96231b3b80d8