Update LLDB for LLVM iterator change in r203364
Update LLDB for LLVM iterator change in r203364

What was use_iterator is now user_iterator.  Also switch to range-based
APIs, as in Clang r203365.


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@203463 91177308-0d34-0410-b5e6-96231b3b80d8

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