[flang-commits] [clang] [flang] [flang] Add checks for Fortran 2023 system clock and add f2023/f202Y to valid arguments of -std= (PR #205938)

[Eugene Epshteyn via flang-commits]

eugeneepshteyn wrote:

Also tagging @ronGreenNV 

https://github.com/llvm/llvm-project/pull/205938