[lldb] Print hint if object description is requested but not implemented #7140
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Lots of users use "po" as their default print command. If the type doesn't implement the description function the output is often not what the user wants. Print a hint telling the user that they might prefer using "p" instead.
Differential Revision: https://reviews.llvm.org/D153489
(cherry picked from commit 5f45a87)