[clang] [clang] Unique the QualType-keyed type pools in a UniquingSet. NFC (PR #221850)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/include/clang/AST/ASTContext.h clang/include/clang/AST/TypeBase.h clang/lib/AST/ASTContext.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/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index a8b256167..c5bb08b89 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -6168,8 +6168,7 @@ QualType ASTContext::getTemplateSpecializationType(
   return QualType(Spec, 0);
 }
 
-QualType
-ASTContext::getParenType(QualType InnerType) const {
+QualType ASTContext::getParenType(QualType InnerType) const {
   llvm::FoldingSetInsertToken Token;
   ParenType *T = ParenTypes.lookup(InnerType, Token);
   if (T)

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https://github.com/llvm/llvm-project/pull/221850