[clang] [OpenACC][CIR] Implement 'async' lowering. (PR #136626)

[Morris Hafner via cfe-commits]

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@@ -639,6 +639,9 @@ OpenACCClause *SemaOpenACCClauseVisitor::VisitVectorLengthClause(
 
 OpenACCClause *SemaOpenACCClauseVisitor::VisitAsyncClause(
     SemaOpenACC::OpenACCParsedClause &Clause) {
+  if (DisallowSinceLastDeviceType<OpenACCAsyncClause>(Clause))
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mmha wrote:

Can you update the comment on `DisallowSinceLastDeviceType()` to include `async`?

https://github.com/llvm/llvm-project/pull/136626