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

[David Spickett via cfe-commits]

DavidSpickett wrote:

> Is there a symbolic link flang-new -> flang? We would like to have a transitional period.

Compiler Explorer would also appreciate this. Though I should be able to get it switched to the new name within a week or two.

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