[clang] [clang-tools-extra] [libcxx] [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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@@ -3397,7 +3397,8 @@ void Sema::DeclareGlobalNewDelete() {
   GlobalNewDeleteDeclared = true;
 
   QualType VoidPtr = Context.getPointerType(Context.VoidTy);
-  QualType SizeT = Context.getSizeType();
+  // FIXME: Why is 'Canonical'SizeType needed here?
+  QualType SizeT = Context.getCanonicalSizeType();
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mizvekov wrote:

What problem do you get if you do use non-canonical type here?

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