[clang] [clang] Fix a "!CodeSynthesisContexts.empty()" assertion failure when constructing aggregate deduction guides. (PR #89227)

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``````````bash
git-clang-format --diff d1a69e4a6ee0b04778da7728123c47eef2290564 04c5dfa09f78fa52b31378295a8d27a20278498a -- clang/lib/Sema/SemaTemplate.cpp clang/test/SemaCXX/cxx20-ctad-type-alias.cpp
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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 8b039c26f2..57752ce020 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -3044,8 +3044,8 @@ FunctionTemplateDecl *DeclareAggregateDeductionGuideForTypeAlias(
 
   LocalInstantiationScope Scope(SemaRef);
   Sema::InstantiatingTemplate BuildingDeductionGuides(
-        SemaRef, AliasTemplate->getLocation(), RHSDeductionGuide,
-        Sema::InstantiatingTemplate::BuildingDeductionGuidesTag{});
+      SemaRef, AliasTemplate->getLocation(), RHSDeductionGuide,
+      Sema::InstantiatingTemplate::BuildingDeductionGuidesTag{});
   if (BuildingDeductionGuides.isInvalid())
     return nullptr;
 

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https://github.com/llvm/llvm-project/pull/89227