Add support for OpenMP scope construct. The private, reduction, and
nowait clauses (introduced in 5.1) are fully supported. Support for the
firstprivate clause (5.2) is also included. The allocate clause (5.2) is
lowered into the omp.scope MLIR op, but MLIR-to-LLVM IR translation is
not yet implemented.
When nowait is combined with reduction, the reduce function argument to
__kmpc_reduce_nowait is passed as null to prevent the runtime from
selecting the tree reduction method for host, which carries a barrier.
Assisted-by: Claude Opus 4.6
133890586e