[flang-commits] [flang] [flang] Allow derf as alternate spelling for erf (PR #95784)

[Peter Klausler via flang-commits]

klausler wrote:

Fortran extension intrinsic functions that start with `D` have historically been DOUBLE PRECISION versions of real intrinsics.  See the`static const SpecificIntrinsicInterface specificIntrinsicFunction` table in `intrinsics.cpp` for other examples, and for the correct way to implement further examples.

https://github.com/llvm/llvm-project/pull/95784