[flang-commits] [flang] [flang][driver] Improve diagnostic for assembly inputs (PR #174316)

[Eugene Epshteyn via flang-commits]

eugeneepshteyn wrote:

@soumikiith to double-check, did you run (1) `ninja check-flang` and (2) llvm-test-suite Fortran tests with this change?

https://github.com/llvm/llvm-project/pull/174316