[clang] [Attributes] Support Attributes being declared as only supporting late parsing when passing an experimental feature flag (PR #88596)

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``````````bash
git-clang-format --diff 9bd10853e505b61f5fe2e3b3592c76787a06aa31 3554ada2c327aa6fb5ce90e26876414123bdca2d -- clang/test/Driver/experimental-late-parse-attributes.c clang/include/clang/Parse/Parser.h clang/lib/Driver/ToolChains/Clang.cpp clang/lib/Parse/ParseDecl.cpp clang/utils/TableGen/ClangAttrEmitter.cpp
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View the diff from clang-format here.
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diff --git a/clang/utils/TableGen/ClangAttrEmitter.cpp b/clang/utils/TableGen/ClangAttrEmitter.cpp
index e06be57d6b..8aa02313da 100644
--- a/clang/utils/TableGen/ClangAttrEmitter.cpp
+++ b/clang/utils/TableGen/ClangAttrEmitter.cpp
@@ -1822,11 +1822,7 @@ void WriteSemanticSpellingSwitch(const std::string &VarName,
   OS << "  }\n";
 }
 
-enum class LateAttrParseKind {
-  Never = 0,
-  Always = 1,
-  ExperimentalOnly = 2
-};
+enum class LateAttrParseKind { Never = 0, Always = 1, ExperimentalOnly = 2 };
 
 static LateAttrParseKind getLateAttrParseKind(const Record *Attr) {
   // This function basically does
@@ -1909,16 +1905,15 @@ static void emitClangAttrLateParsedListImpl(RecordKeeper &Records,
 static void emitClangAttrLateParsedList(RecordKeeper &Records,
                                         raw_ostream &OS) {
   OS << "#if defined(CLANG_ATTR_LATE_PARSED_LIST)\n";
-  emitClangAttrLateParsedListImpl(Records, OS,
-                                  LateAttrParseKind::Always);
+  emitClangAttrLateParsedListImpl(Records, OS, LateAttrParseKind::Always);
   OS << "#endif // CLANG_ATTR_LATE_PARSED_LIST\n\n";
 }
 
 static void emitClangAttrLateParsedExperimentalList(RecordKeeper &Records,
                                                     raw_ostream &OS) {
   OS << "#if defined(CLANG_ATTR_LATE_PARSED_EXPERIMENTAL_LIST)\n";
-  emitClangAttrLateParsedListImpl(
-      Records, OS, LateAttrParseKind::ExperimentalOnly);
+  emitClangAttrLateParsedListImpl(Records, OS,
+                                  LateAttrParseKind::ExperimentalOnly);
   OS << "#endif // CLANG_ATTR_LATE_PARSED_EXPERIMENTAL_LIST\n\n";
 }
 

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https://github.com/llvm/llvm-project/pull/88596