[PATCH] Fortran: add Fortran 2018 IEEE_{MIN,MAX} functions

[FX via Gcc-patches]

Hi,

This patch adds four IEEE functions from the Fortran 2018 standard: 
IEEE_MIN_NUM, IEEE_MAX_NUM, IEEE_MIN_NUM_MAG, and IEEE_MAX_NUM_MAG.

Bootstrapped and regtested on x86_64-pc-linux-gnu, both 32 and 64-bit. OK to 
commit?

FX

0001-Fortran-add-Fortran-2018-IEEE_-MIN-MAX-functions.patch
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