[polymorphic-builtins] Teach dataflow diagnostics how to emit an erro… #27284
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…r if it sees an unspecialized polymorphic builtin.
This will ensure that if an expert user is using this feature and makes a
mistake as a result of tweaking their code, they get an error. This will ensure
they do not ship and look into why this is happening.
This is not intended to be used by anyone except for expert stdlib users.