When a module completes the definition of a class template specialization imported from another module, emit an update record, rather than using the broken decl rewriting mechanism. If multiple modules do this, merge the definitions together, much as we would if they were separate declarations.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206680 91177308-0d34-0410-b5e6-96231b3b80d8