[MLIR][OpenMP] Clause-based OpenMP operation definition (#92523)

This patch updates `OpenMP_Op` definitions to be based on the new set of
`OpenMP_Clause` definitions, and to take advantage of clause-based
automatically-generated argument lists, descriptions, assembly format
and class declarations.

There are also changes introduced to the clause operands structures to
match the current set of tablegen clause definitions. These two are very
closely linked and should be kept in sync. It would probably be a good
idea to try generating clause operands structures from the tablegen
`OpenMP_Clause` definitions in the future.

As a result of this change, arguments for some operations have been
reordered. This patch also addresses this by updating affected operation
build calls and unit tests. Some other updates to tests related to the
order of arguments in the resulting assembly format and others due to
certain previous inconsistencies in the printing/parsing of clauses are
addressed.

The printer and parser functions for the `map` clause are updated, so
that they are able to handle `map` clauses linked to entry block
arguments as well as those which aren't.

This PR causes a build failure in the flang subproject. This is addressed
by the next PR in the stack.

0 files changed, 0 insertions, 0 deletions