[Bug middle-end/118594] expansion of bf16 to float should not produce (subreg (mem ())

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118594

--- Comment #9 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
(In reply to Richard Sandiford from comment #8)
> But that doesn't work because force_operand considers the subreg to be valid
> (and general_operand agrees).
…because the subreg isn't paradoxical, I forgot to add.