Do not refresh the names of implicit arguments.

Try just going with the user-given names, and not worrying about
what happens with repeated names or anonymous implicits.
(Support for anonymous implicits is due to herbelin in #11098.)

This PR should not change behaviour in the absence of repeated names.
Since repeated names are already a poorly handled corner case, I would
recommend changing binder names to avoid overlap in the case of a
change in behavior.

Since anonymous implicits and implicits with repeated names can already
happen, I think this is unlikely to cause too many new problems,
though it might exacerbate existing ones. However, I already had to fix
one newly possible anomaly, so I can't be too confident.

The most common change in external developments was that an argument
no longer gets `0` appended to it, causing the `Arguments` command
to complain about renaming.
To fix this and keep the old name, one can simply use the `rename` flag
as suggested, or switch to the new, un-suffixed name.

Closes #6785
Closes #12001

Another step towards checking the standard library with `-mangle-names`.

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