[clang] [OpenACC} Improve diagnostics for 'tag's on clauses/directives (PR #77957)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff e4d01bb2273804355cf84a8a560e578735590ac2 12f5f321bc47bffb2d1694e605288c59976022e6 -- clang/include/clang/Basic/OpenACCKinds.h clang/lib/Parse/ParseOpenACC.cpp clang/test/ParserOpenACC/parse-cache-construct.c
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Basic/OpenACCKinds.h b/clang/include/clang/Basic/OpenACCKinds.h
index a06db98fcb..399222dbf7 100644
--- a/clang/include/clang/Basic/OpenACCKinds.h
+++ b/clang/include/clang/Basic/OpenACCKinds.h
@@ -130,7 +130,6 @@ inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &Out,
 
   case OpenACCDirectiveKind::Invalid:
     return Out << "<invalid>";
-
   }
   llvm_unreachable("Uncovered directive kind");
 }
diff --git a/clang/lib/Parse/ParseOpenACC.cpp b/clang/lib/Parse/ParseOpenACC.cpp
index fb4364fa1d..fe35690ab1 100644
--- a/clang/lib/Parse/ParseOpenACC.cpp
+++ b/clang/lib/Parse/ParseOpenACC.cpp
@@ -178,7 +178,6 @@ bool isTokenIdentifierOrKeyword(Parser &P, Token Tok) {
   return false;
 }
 
-
 /// Parses and consumes an identifer followed immediately by a single colon, and
 /// diagnoses if it is not the 'special token' kind that we require. Used when
 /// the tag is the only valid value.

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https://github.com/llvm/llvm-project/pull/77957