[flang][OpenMP] Use new modifiers in DEPEND/GRAINSIZE/NUM_TASKS (#117917)

The usual changes, added more references to OpenMP specs.

[flang][OpenMP] Normalize clause modifiers that exist on their own (#116655)

This is the first part of the effort to make parsing of clause modifiers
more uniform and robust. Currently, when multip

[flang][OpenMP] Normalize clause modifiers that exist on their own (#116655)

This is the first part of the effort to make parsing of clause modifiers
more uniform and robust. Currently, when multiple modifiers are allowed,
the parser will expect them to appear in a hard-coded order.
Additionally, modifier properties (such as "ultimate") are checked
separately for each case.

The overall plan is
1. Extract all modifiers into their own top-level classes, and then
equip them with sets of common properties that will allow performing the
property checks generically, without refering to the specific kind of
the modifier.
2. Define a parser (as a separate class) for each modifier.
3. For each clause define a union (std::variant) of all allowable
modifiers, and parse the modifiers as a list of these unions.

The intent is also to isolate parts of the code that could eventually be
auto-generated.

OpenMP modifier overhaul: #1/3

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[flang][OpenMP] Parse DOACROSS clause (#115396)

Extract the SINK/SOURCE parse tree elements into a separate class
`OmpDoacross`, share them between DEPEND and DOACROSS clauses. Most of
the changes

[flang][OpenMP] Parse DOACROSS clause (#115396)

Extract the SINK/SOURCE parse tree elements into a separate class
`OmpDoacross`, share them between DEPEND and DOACROSS clauses. Most of
the changes in Semantics are to accommodate the new contents of
OmpDependClause, and a mere introduction of OmpDoacrossClause.

There are no semantic checks specifically for DOACROSS.

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[flang][OpenMP] Parser support for DEPOBJ plus DEPEND, DESTROY, UPDATE (#114074)

Parse the DEPOBJ construct and the associated clauses, perform basic
semantic checks.