the rule that defines the implicit copy constructor/implicit copy
asssignment operator as deleted when a move constructor or move
assignment operator has been explicitly declared. This has hit a
number of people because Boost 1.47.0's shared_ptr fails to declare a
copy constructor.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140621 91177308-0d34-0410-b5e6-96231b3b80d8