[Bug middle-end/91226] wrong propagation of non-canonical _Decimal64 and _Decimal128 constant (BID only)

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91226

--- Comment #4 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Fixed for GCC 10.  Leaving open for now for possible backports to GCC 9 and 8
branches as a wrong-code fix.