[Bug target/92488] GCC generates calls to __dpd_trunctdsd2 with -mhard-dfp

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92488

--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(So, pre-approved with that change, and with a testcase...  A run test
ideally, if that isn't too hard?)