[Bug debug/120738] ctf: use CTF_FP_LDOUBLE encoding for 128-bit floats

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120738

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Long double could be 64bit while having _Float128 too. This is allowed with c23
even. Even _Float16 is not able to be represented.