[clang] Redesign handling of anyAppleOS availability attribute (PR #190817)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,h,cpp -- clang/test/Index/annotate-comments-availability-anyappleos.cpp clang/include/clang/Sema/Sema.h clang/lib/AST/AttrImpl.cpp clang/lib/AST/DeclBase.cpp clang/lib/Index/CommentToXML.cpp clang/lib/Sema/SemaAPINotes.cpp clang/lib/Sema/SemaAvailability.cpp clang/lib/Sema/SemaDecl.cpp clang/lib/Sema/SemaDeclAttr.cpp clang/lib/Sema/SemaHLSL.cpp clang/test/Sema/attr-availability-anyappleos-ast.c clang/tools/libclang/CIndex.cpp clang/utils/TableGen/ClangAttrEmitter.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/utils/TableGen/ClangAttrEmitter.cpp b/clang/utils/TableGen/ClangAttrEmitter.cpp
index f492e8df4..21c0a9d58 100644
--- a/clang/utils/TableGen/ClangAttrEmitter.cpp
+++ b/clang/utils/TableGen/ClangAttrEmitter.cpp
@@ -1486,7 +1486,8 @@ namespace {
       if (!AttrType.empty()) {
         OS << "\n";
         OS << "  " << AttrType << " *get" << getUpperName() << "As() const {\n";
-        OS << "    return llvm::cast_or_null<" << AttrType << ">(" << getLowerName() << ");\n";
+        OS << "    return llvm::cast_or_null<" << AttrType << ">("
+           << getLowerName() << ");\n";
         OS << "  }\n";
         OS << "  void set" << getUpperName() << "As(" << AttrType << " *V) {\n";
         OS << "    " << getLowerName() << " = V;\n";

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https://github.com/llvm/llvm-project/pull/190817