Be robust in calculating visible ids for non-registered constants.

The previous code was only doing that when either in debug or toplevel mode.
Unfortunately, when dealing with open modules the constants might not have
been registered yet, leading to printing failure. I do not see a reason
why this code should fail when used with globals without a user facing name
when the only goal is to compute a set of identifiers that might clash. Thus,
the above failsafe behaviour is now systematic.

Fixes #8206: Module signature error sometimes prints ??.

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