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

[Matheus Izvekov via cfe-commits]

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@@ -7246,6 +7250,24 @@ QualType TreeTransform<Derived>::TransformDependentBitIntType(
   return Result;
 }
 
+template <typename Derived>
+QualType TreeTransform<Derived>::TransformPredefinedSugarType(
+    TypeLocBuilder &TLB, PredefinedSugarTypeLoc TL) {
+  const PredefinedSugarType *EIT = TL.getTypePtr();
+  QualType Result = TL.getType();
+
+  if (getDerived().AlwaysRebuild()) {
+    Result = getDerived().RebuildPredefinedSugarType(
+        EIT->getKind(), EIT->desugar(), TL.getNameLoc());
+    if (Result.isNull())
+      return QualType();
+  }
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mizvekov wrote:

If this had an underlying type, then this would need to transform that as well. But if not, I don't think you should bother transforming anything, just rebuild inline.

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