lldb - fix misleading "valid target indexes are" error message
lldb - fix misleading "valid target indexes are" error message

See http://reviews.llvm.org/D4430 for more details.

Change by Paul Osmialowski.


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@216766 91177308-0d34-0410-b5e6-96231b3b80d8

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