[cfe-dev] Ensure name doesn't already exist

[Daniel Dilts]

I am possibly renaming a class.  I would like to make sure that the new
name doesn't already exist.  Given that I am generating the new name, I
have it in a std::string.

How would I check to see if there is already something with the new name in
the DeclContext?  I assume I would use DeclContext::lockup of some flavor.
Also, the new name does not specify any namespaces (no :: anywhere in it).
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