[clang] [flang] [llvm] [OpenMP] Add parser/semantic support for dyn_groupprivate clause (PR #152651)

[Kevin Sala Penades via cfe-commits]

================
@@ -1104,6 +1107,7 @@ def OMP_Target : Directive<[Spelling<"target">]> {
   let allowedOnceClauses = [
     VersionedClause<OMPC_DefaultMap>,
     VersionedClause<OMPC_Device>,
+    VersionedClause<OMPC_DynGroupprivate>,
----------------
kevinsala wrote:

The restriction in the spec is correct. Currently, only `cgroup` is allowed in 
`dyn_groupprivate`, so at most one instantiation of this clause is permitted in 
practice.

If you consider that this check must be moved somewhere else, let me know.

https://github.com/llvm/llvm-project/pull/152651
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