[flang][OpenMP] Decompose combined construct selectors in variant matching (#205802)
The previous code resolved a `construct={...}` selector by mapping its
name to a trait through a string lookup
(`getOpenMPContextTraitSelectorKind` ->
`getOpenMPContextTraitPropertyForSelector`). That works for a standalone
leaf construct such as `parallel`, whose name matches a single construct
selector string, but not for a combined/composite directive such as
`target teams`: its name (`"target teams"`) matches no selector string,
so the lookup returns `invalid` and the selector's construct traits are
dropped.
This PR adds `AppendConstructTraitsForDirective` that walks the
directive sets and adds each leaf trait, so combined directives are no
longer reduced to a single (or dropped) trait. It also handles the
standalone `dispatch` construct trait.
Fixes https://github.com/llvm/llvm-project/issues/205664
Assisted-by: Cursor
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