[clang] [OpenACC] Implement enter data/exit data construct parsing (PR #72916)

[Alexey Bataev via cfe-commits]

================
@@ -91,10 +140,19 @@ OpenACCDirectiveKind ParseOpenACCDirectiveKind(Parser &P) {
   P.ConsumeToken();
   std::string FirstTokSpelling = P.getPreprocessor().getSpelling(FirstTok);
 
-  OpenACCDirectiveKind DirKind = getOpenACCDirectiveKind(FirstTokSpelling);
+  OpenACCDirectiveKindEx ExDirKind = getOpenACCDirectiveKind(FirstTokSpelling);
+
+  switch (ExDirKind) {
+  case OpenACCDirectiveKindEx::Invalid:
+    P.Diag(FirstTok, diag::err_acc_invalid_directive) << 0 << FirstTokSpelling;
+    return OpenACCDirectiveKind::Invalid;
+  case OpenACCDirectiveKindEx::Enter:
+  case OpenACCDirectiveKindEx::Exit:
+    return ParseOpenACCEnterExitDataDirective(P, FirstTok, FirstTokSpelling,
+                                              ExDirKind);
+  }
----------------
alexey-bataev wrote:

All branches have return statement. Looks like the rest of the code in the 
function is dead.

https://github.com/llvm/llvm-project/pull/72916
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