Simplify the definition of PredefinedSugarTypeLoc

Author: YexuanXiao

clang/include/clang/AST/TypeLoc.h

@@ -2767,10 +2767,6 @@ class DependentBitIntTypeLoc final
     : public InheritingConcreteTypeLoc<TypeSpecTypeLoc, DependentBitIntTypeLoc,
                                        DependentBitIntType> {};
 
-class PredefinedSugarTypeLoc final
-    : public InheritingConcreteTypeLoc<TypeSpecTypeLoc, PredefinedSugarTypeLoc,
-                                       PredefinedSugarType> {};
-
 class ObjCProtocolLoc {
   ObjCProtocolDecl *Protocol = nullptr;
   SourceLocation Loc = SourceLocation();
@@ -2787,6 +2783,15 @@ class ObjCProtocolLoc {
   }
 };
 
+struct PredefinedSugarTypeLocInfo {}; // Nothing.
+
+class PredefinedSugarTypeLoc final
+    : public ConcreteTypeLoc<UnqualTypeLoc, PredefinedSugarTypeLoc,
+                             PredefinedSugarType, PredefinedSugarTypeLocInfo> {
+public:
+  void initializeLocal(ASTContext &Context, SourceLocation loc) {}
+};
+
 } // namespace clang
 
 #endif // LLVM_CLANG_AST_TYPELOC_H

clang/lib/Serialization/ASTReader.cpp

@@ -7455,7 +7455,7 @@ void TypeLocReader::VisitDependentBitIntTypeLoc(
 }
 
 void TypeLocReader::VisitPredefinedSugarTypeLoc(PredefinedSugarTypeLoc TL) {
-  TL.setNameLoc(readSourceLocation());
+  // Nothing to do.
 }
 
 void ASTRecordReader::readTypeLoc(TypeLoc TL) {

clang/lib/Serialization/ASTWriter.cpp

@@ -704,7 +704,7 @@ void TypeLocWriter::VisitDependentBitIntTypeLoc(
 
 void TypeLocWriter::VisitPredefinedSugarTypeLoc(
     clang::PredefinedSugarTypeLoc TL) {
-  addSourceLocation(TL.getNameLoc());
+  // Nothing to do.
 }
 
 void ASTWriter::WriteTypeAbbrevs() {