[clang] [clang][OpenMP] Add OMP 6.0 prefer_type({fr,attr}) parsing for interop (PR #198868)

[Alexey Bataev via cfe-commits]

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@@ -18967,9 +18967,14 @@ OMPClause *SemaOpenMP::ActOnOpenMPInitClause(
   if (!isValidInteropVariable(SemaRef, InteropVar, VarLoc, OMPC_init))
     return nullptr;
 
-  // Check prefer_type values.  These foreign-runtime-id values are either
-  // string literals or constant integral expressions.
-  for (const Expr *E : InteropInfo.PreferTypes) {
+  // Check prefer_type values. fr() arguments are either string literals or
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alexey-bataev wrote:

Need to check attr here for validity?

https://github.com/llvm/llvm-project/pull/198868