Revert "[Clang] Make the SizeType, SignedSizeType and PtrdiffType be named sugar types instead of built-in types (#143653)"

This reverts commit c27e283cfbca2bd22f34592430e98ee76ed60ad8.

A builbot failure has been reported:
https://lab.llvm.org/buildbot/#/builders/186/builds/10819/steps/10/logs/stdio

I'm also getting a large number of warnings related to %zu and %zx.

1 files changed, 0 insertions, 7 deletions

diff --git a/clang/lib/AST/ASTStructuralEquivalence.cpp b/clang/lib/AST/ASTStructuralEquivalence.cpp
index 0f2762d..289c6d7 100644
--- a/clang/lib/AST/ASTStructuralEquivalence.cpp
+++ b/clang/lib/AST/ASTStructuralEquivalence.cpp
@@ -1477,13 +1477,6 @@ static bool IsStructurallyEquivalent(StructuralEquivalenceContext &Context,
       return false;
     break;
   }
-  case Type::PredefinedSugar: {
-    const auto *TP1 = cast<PredefinedSugarType>(T1);
-    const auto *TP2 = cast<PredefinedSugarType>(T2);
-    if (TP1->getKind() != TP2->getKind())
-      return false;
-    break;
-  }
   } // end switch
 
   return true;