[clang] [Clang] Implement CWG2900 (PR #224291)

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


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/test/SemaTemplate/temp_arg_nontype_arg_type.cpp clang/include/clang/Sema/Sema.h clang/lib/Sema/SemaTemplate.cpp clang/lib/Sema/SemaTemplateDeduction.cpp clang/test/CXX/drs/cwg29xx.cpp --diff_from_common_commit
``````````

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in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 2288cd744..cde2f242f 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -5572,9 +5572,9 @@ bool Sema::CheckTemplateArgument(NamedDecl *Param, TemplateArgumentLoc &ArgLoc,
     //   parameter of type decltype(auto) ([temp.func.order]), the declaration
     //   is ill-formed.
     auto isUndeducedAuto = [](QualType T, bool DecltypeAuto) {
-              const AutoType *AT = T->getContainedAutoType();
-              return AT && AT->isDecltypeAuto() == DecltypeAuto &&
-                     AT->getDeducedType().isNull();
+      const AutoType *AT = T->getContainedAutoType();
+      return AT && AT->isDecltypeAuto() == DecltypeAuto &&
+             AT->getDeducedType().isNull();
     };
     if (CTAI.PartialOrdering &&
         isUndeducedAuto(NTTPType, /*DecltypeAuto=*/false) &&

``````````

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https://github.com/llvm/llvm-project/pull/224291