[clang] [clang-tools-extra] [Clang] Make the SizeType, SignedSizeType and PtrdiffType be named sugar types instead of built-in types (PR #143653)

[via cfe-commits]

================
@@ -14536,6 +14589,9 @@ static QualType getCommonSugarTypeNode(ASTContext &Ctx, 
const Type *X,
                                       DX->isCountInBytes(), DX->isOrNull(),
                                       CDX);
   }
+  case Type::PredefinedSugar: {
+    return QualType();
+  }
----------------
YexuanXiao wrote:

Making it unreachable causes the test PCH/cxx2a-constraints.cpp to fail. I will 
try to investigate it.

https://github.com/llvm/llvm-project/pull/143653
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