[Bug middle-end/123849] ICE (segfault) involving operator new and std::float16_t

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123849

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> DEMANGLE_COMPONENT_EXTENDED_BUILTIN_TYPE is not handled.

Patch in testing.