[clang] [flang] [llvm] [openmp] [Clang][OpenMP][LoopTransformations] Add support for "#pragma omp fuse" loop transformation directive and "looprange" clause (PR #139293)

[Roger Ferrer Ibáñez via llvm-commits]

rofirrim wrote:

Hi all, @eZWALT is changing jobs and kindly asked me if I could finish on his behalf. I plan to go through all the items of feedback and then rebase against main.

https://github.com/llvm/llvm-project/pull/139293