[PATCH] Fortran: add IEEE_QUIET_* and IEEE_SIGNALING_* comparisons

[FX]

Hi,

These operations were added to Fortran 2018, and correspond to well-defined IEEE comparison operations, with defined signaling semantics for NaNs. All are implemented in terms of GCC expressions and built-ins, with no library support needed.

Bootstrapped and regtested on x86_64-linux, both 32- and 64-bit. Depends on a patch currently under review for the middle-end (https://gcc.gnu.org/pipermail/gcc-patches/2022-September/600840.html).

OK to commit?
FX


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