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

[Matheus Izvekov via cfe-commits]

================
@@ -7248,6 +7250,22 @@ 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(
+        llvm::to_underlying(EIT->getKind()));
+  }
+
+  PredefinedSugarTypeLoc NewTL = TLB.push<PredefinedSugarTypeLoc>(Result);
+  NewTL.setNameLoc(TL.getNameLoc());
+  return Result;
+}
----------------
mizvekov wrote:

I don't think anyone would object if this was simply unreachable, I can't think 
of a use case for transforming these.
This seems untested either way.

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