[Bug target/58757] Advertise the lack of denormal support on alpha without -mieee

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58757

--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
If the testcase is still xfailed, I would say there is still something to be
fixed...