Revert "Fix a build breakage. Looks like the LLVM side of this change has been reverted"
Revert "Fix a build breakage. Looks like the LLVM side of this change has been reverted"

This reverts commit r223375.  We need to use unique_ptr to build with
LLVM r223183.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@223388 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb