bug#56739: 29.0.50; `cl-psetq' and `cl-psetf' fail to recognize symbol macros

[Wing Hei Chan]

Resending this message as I didn't send it to the thread.

 > Afaik, *left-hand* side symbol macros are all handled correctly:
 >
 > - `setq' is handled by `cl-symbol-macrolet' itself;
 > - `setf' expands symbol macros as needed;
 > - `cl-setq' and `cl-setf' expand to `setf'.
 >
 > The original bug is about *right-hand* side symbol macros, namely that
 > `cl-setq' and `cl-setf' can introduce an unsound optimization in such
 > cases.  In fact, I'm not sure this optimization is needed anymore (see
 > Stefan's comment).  The simplest way to fix the bug is to remove the
 > optimization, but I'll leave the decision to more knowledgeable people.