[Bug fortran/113152] Fortran 2023 half-cycle trigonometric functions

[kargl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113152

--- Comment #6 from kargl at gcc dot gnu.org ---
In reflecting on the possibility of an OS lacking support for
REAL(10) but having a REAL(16), the mapping of types into 
C are likely REAL(4) <--> float, REAL(8) <--> double, and
REAL(16) <--> long double.  The current patch sort of gets 
this wrong, because REAL(16) is not properly mapped.  I'll
fix that shortly.