Use copy.deepcopy instead of doing it manually.

Reviewers: EricWF

Reviewed By: EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D29209

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294350 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed