[Bug c/119408] LoongArch: Q Suffix for __float128 Literals Not Supported

[wszqkzqk at qq dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119408

--- Comment #2 from Zhou Qiankang <wszqkzqk at qq dot com> ---
(In reply to Richard Biener from comment #1)
> Q is an extension, 1.11111f128 should work.  The extension is enabled only
> for some platforms.

But this extension (__flaot128) actually enables on LoongArch64 platform.