If a class template specialization from one module has its definition

If a class template specialization from one module has its definition
instantiated in another module, and the instantiation uses a partial
specialization, include the partial specialization and its template arguments
in the update record. We'll need them if someone imports the second module and
tries to instantiate a member of the template.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209472 91177308-0d34-0410-b5e6-96231b3b80d8