[Bug c++/91364] Implement P0388R4: Permit conversions to arrays of unknown bound

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91364
Bug 91364 depends on bug 69531, which changed state.

Bug 69531 Summary: Implement CWG 1307; Differently bounded array parameters
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69531

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED