================
@@ -2258,6 +2258,30 @@ class alignas(TypeAlignment) Type : public 
ExtQualsTypeCommonBase {
     unsigned NumExpansions;
   };
 
+  enum class PredefinedSugarKind {
+    /// The "size_t" type.
+    SizeT,
+
+    /// The signed integer type corresponding to "size_t".
+    SignedSizeT,
+
+    /// The "ptrdiff_t" type.
+    PtrdiffT,
+
+    // Indicates how many items the enum has.
+    NumElements
----------------
erichkeane wrote:

Right, I saw that.  Just different-enough from how we create our enums + 
requires actually making sure it is in every 'switch'.  Vs just doing `Last = 
PtrdiffT`, then:
` mutable std::array<Type *, 
llvm::to_underlying(PredefinedSugarType::Kind::Last +1)>`

Which is what we do elsewhere.

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