Revert "StringSwitch cannot be copied or moved."

This reverts commit r276652. The clang-query tool is currently
relying on this behavior. I'll try again later.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276661 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed