[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]

================
@@ -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:

Shouldn't this be `NumElements = PtrdiffT`?  Typically we do something like 
`Last = ` kinda thing in our enums, so this is a little odd/awkward.

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