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

[Brad Richardson via cfe-commits]

everythingfunctional wrote:

> @everythingfunctional Following are the steps to run the testsuite. Please check and confirm if you did not run it before.
> 
> ```
> git clone https://github.com/llvm/llvm-test-suite.git
> cd llvm-test-suite
> mkdir build
> cd build
> cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=$HOME/llvm-project/build_release/bin/clang  -DCMAKE_CXX_COMPILER=$HOME/llvm-project/build_release/bin/clang++ -DCMAKE_Fortran_COMPILER=$HOME/llvm-project/build_release/bin/flang-new -DTEST_SUITE_FORTRAN=On -DTEST_SUITE_SUBDIRS=Fortran -DTEST_SUITE_FORTRAN_ISO_C_HEADER_DIR=$HOME/llvm-project/flang/include/flang ../
> make -j48
> NO_STOP_MESSAGE=1 $HOME/llvm-project/build_release/bin/llvm-lit -v  .
> ```

Only failure I got was:

```text
Failed Tests (1):
  test-suite :: Fortran/gfortran/regression/gomp/gfortran-regression-compile-regression__gomp__proc_ptr_1_f90.test
```

Which I don't think the rename is at fault for.

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