[flang] [llvm] [flang] Classify IEEE_ARITHMETIC elemental functions as SIMPLE (PR #223254)

[Šárka Holendová via llvm-commits]

mlir-maiden wrote:

Note: I plan to update the F202X.md SIMPLE status to reflect the IEEE_ARITHMETIC elemental function classification after #223160 lands, since that PR is already updating the same status block.

https://github.com/llvm/llvm-project/pull/223254