threadSafety::CopyOnWriteVector: Use LLVM_DELETED_FUNCTION here due to missing functionality of msc17.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206345 91177308-0d34-0410-b5e6-96231b3b80d8
Reformat.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206346 91177308-0d34-0410-b5e6-96231b3b80d8