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

[Kiran Chandramohan via cfe-commits]

kiranchandramohan 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  .
```

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