Use TypeName to represent type names in certain commands
In COMMENT, DROP, SECURITY LABEL, and the new pg_get_object_address function, we were representing types as a list of names, same as other objects; but types are special objects that require their own representation to be totally accurate. In the original COMMENT code we had a note about fixing it which was lost in the course of c10575ff. Change all those places to use TypeName instead, as suggested by that comment. Right now the original coding doesn't cause any bugs, so no backpatch. It is more problematic for proposed future code that operate with object addresses from the SQL interface; type details such as array-ness are lost when working with the degraded representation. Thanks to Petr Jelínek and Dimitri Fontaine for offlist help on finding a solution to a shift/reduce grammar conflict.
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