Fix clang builds that were broken due to SDKROOT changes of you have an internal OS build.
Fix clang builds that were broken due to SDKROOT changes of you have an internal OS build.



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@172582 91177308-0d34-0410-b5e6-96231b3b80d8

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