[clang] [Clang] Add [[clang::no_specializations]] (PR #101469)

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


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``````````bash
git-clang-format --diff bfe486fe764667d514124faf2b39afb7e7322640 5dd5dd4e7a7733412fb20368202c657f97b635a2 --extensions cpp -- clang/test/SemaCXX/attr-no-specializations.cpp clang/lib/Sema/SemaDeclAttr.cpp clang/lib/Sema/SemaTemplate.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index b8d9a3ebe8..ad5a6f51bd 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -1215,8 +1215,7 @@ static void handlePreferredName(Sema &S, Decl *D, const ParsedAttr &AL) {
         << TT->getDecl();
 }
 
-static void handleNoSpecializations(Sema &S, Decl *D,
-                                          const ParsedAttr &AL) {
+static void handleNoSpecializations(Sema &S, Decl *D, const ParsedAttr &AL) {
   StringRef Message;
   if (AL.getNumArgs() != 0)
     S.checkStringLiteralArgumentAttr(AL, 0, Message);

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https://github.com/llvm/llvm-project/pull/101469