[clang] [flang] [llvm] [flang][driver] rename flang-new to flang (PR #110023)

[KAWASHIMA Takahiro via llvm-commits]

kawashima-fj wrote:

Thanks for the PR.
Is there a symbolic link `flang-new` -> `flang`? We would like to have a transitional period.

https://github.com/llvm/llvm-project/pull/110023