[modules] When we merge together multiple class template specialization

[modules] When we merge together multiple class template specialization
definitions (because some other declaration declares a special member that
isn't present in the canonical definition), we need to search *all* of them; we
can't just stop when we find the requested name in any of the definitions,
because that can fail to find things (and in particular, it can fail to find
the member of the canonical declaration and return a bogus ODR failure).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@215612 91177308-0d34-0410-b5e6-96231b3b80d8