[flang][lowering] Add support for lowering of the `ibset` intrinsic
This patch adds support for lowering of the `ibset` intrinsic from Fortran
to the FIR dialect of MLIR.
This is part of the upstreaming effort from the `fir-dev` branch in [1].
[1] https://github.com/flang-compiler/f18-llvm-project
Co-authored-by: Jean Perier <jperier@nvidia.com>
Co-authored-by: Valentin Clement <clementval@gmail.com>
Co-authored-by: V Donaldson <vdonaldson@nvidia.com>
Differential Revision: https://reviews.llvm.org/D121717