[flang][runtime] Better real MOD/MODULO results (#77167) The Fortran standard defines real MOD and MODULO with expressions like MOD(a,p) = a - AINT(a/p)*p. Unfortunately, these definitions have poor accuracy when a is much larger in magnitude than p, and every Fortran compiler uses better algorithms instead. Fixes llvm-test-suite/Fortran/gfortran/regression/mod_large_1.f90.
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