[flang-commits] [flang] [llvm] [flang] Implement 'F_C_STRING' library function (Fortran 2023) (PR #174474)

[Eugene Epshteyn via flang-commits]

eugeneepshteyn wrote:

@cenewcombe , in llvm-test-suite/Fortran/gfortran, there are two tests that are currently disabled, but should be tried with your change:
```
$ grep -r f_c_string1
regression/DisabledFiles.cmake:  f_c_string1.f90
regression/tests.cmake:run;f_c_string1.f90;;;;

$ grep -r f_c_string2
regression/DisabledFiles.cmake:  f_c_string2.f90
regression/tests.cmake:run;f_c_string2.f90;;;;
```
Please remove them from DiabledFiles.cmake and and confirm that they pass. (Once this PR is submitted, you can then make a separate PR for llvm-test-suite to enable those tests.)

https://github.com/llvm/llvm-project/pull/174474