================
@@ -2258,6 +2258,27 @@ class alignas(TypeAlignment) Type : public 
ExtQualsTypeCommonBase {
     unsigned NumExpansions;
   };
 
+  enum class PredefinedSugarKind {
+    /// The "size_t" type.
+    SizeT,
+
+    /// The "signed size_t" type.
----------------
YexuanXiao wrote:

@frederick-vs-ja [mentioned in the comment 
above](https://github.com/llvm/llvm-project/pull/143653#discussion_r2141546366) 
that POSIX does not require the `typedef` `ssize_t` to be the `signed` version 
of `size_t`. At the same time, the C and C++ standards also do not require the 
`typedef` `ptrdiff_t` to be the `signed` version of `size_t`. I am not sure 
whether there actually exist platforms with such inconsistencies, but perhaps 
it should not be confused?

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