Replace an accidentally added "break" with an LLVM_FALLTHROUGH.
Replace an accidentally added "break" with an LLVM_FALLTHROUGH.

Thanks to Greg Clayton for catchting this!

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@321123 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 0ee930d61f3232fd5fc0b7bf24f7362e021c229d)

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb