[MLIR][OpenMP] Group clause operands into structures and use them to define simplified op builders (#86797)

This patch introduces a set of composable structures grouping the MLIR
operands associated to each OpenMP clause. This makes it easier to keep
the MLIR representation for the same clause consistent throughout all
operations that accept it.

The relevant clause operand structures are grouped into per-operation
structures using a mixin pattern and used to define new operation
constructors. These constructors can be used to avoid having to get the
order of a possibly large list of operands right.

Missing clauses are documented as TODOs, as well as operands which are
part of the relevant operation's operand structure but cannot be
attached to the associated operation yet, due to missing op arguments to
its MLIR definition.

A follow-up patch will update Flang lowering to make use of these
structures, simplifying the passing of information from clause
processing to operation-generating functions and also simplifying the
creation of operations through the use of the new operation
constructors.

0 files changed, 0 insertions, 0 deletions