[clang] Revert "[Clang][Sema] Diagnose unexpanded packs in the template argument lists of function template specializations" (PR #76876)

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


:warning: C/C++ code formatter, clang-format found issues in your code. 
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``````````bash
git-clang-format --diff 49b492048af2b2093aaed899c0bbd6d740aad83c 
687396b5f4ba0713d103ebd172b308e92eb930cc -- clang/lib/Sema/SemaDecl.cpp 
clang/test/CXX/temp/temp.decls/temp.variadic/p5.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 2de6319413..211964c561 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -9907,8 +9907,7 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, 
DeclContext *DC,
             D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId
                 ? D.getName().TemplateId
                 : nullptr,
-            TemplateParamLists, isFriend, isMemberSpecialization,
-            Invalid);
+            TemplateParamLists, isFriend, isMemberSpecialization, Invalid);
     if (TemplateParams) {
       // Check that we can declare a template here.
       if (CheckTemplateDeclScope(S, TemplateParams))
@@ -10446,8 +10445,7 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, 
DeclContext *DC,
       TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
       ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
                                          TemplateId->NumArgs);
-      translateTemplateArguments(TemplateArgsPtr,
-                                 TemplateArgs);
+      translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
 
       HasExplicitTemplateArgs = true;
 
@@ -10456,7 +10454,7 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, 
DeclContext *DC,
       } else if (FunctionTemplate) {
         // Function template with explicit template arguments.
         Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
-          << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
+            << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
 
         HasExplicitTemplateArgs = false;
       } else if (isFriend) {

``````````

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https://github.com/llvm/llvm-project/pull/76876
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