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

[Erich Keane 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;
+}
----------------
erichkeane wrote:

Ah, so we actually DO have to implement this, `TreeTransform` is used for more 
than just template instantiation, so we have downstreams who likely are going 
to be grumpy if this is an unreachable, since this is able to be gotten to with 
libclang.

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