[Bug c/91985] Unsupported DFP not diagnosed with constants or built-in functions

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91985
Bug 91985 depends on bug 92906, which changed state.

Bug 92906 Summary: [10 regression] FAIL: libstdc++-abi/abi_check
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92906

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