When adding the base and member initializers for an implicitly-defined

special member function, make sure to classify an explicitly-defaulted
copy constructor as a "copy" operation. Fixes PR10622.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137219 91177308-0d34-0410-b5e6-96231b3b80d8