[TextAPI] Fixup symbol names of ivars from extensions (#83525)

Author: cyndyishida

llvm/include/llvm/TextAPI/Record.h

@@ -156,6 +156,8 @@ class ObjCCategoryRecord : public ObjCContainerRecord {
       : ObjCContainerRecord(Name, RecordLinkage::Unknown),
         ClassToExtend(ClassToExtend) {}
 
+  StringRef getSuperClassName() const { return ClassToExtend; }
+
 private:
   StringRef ClassToExtend;
 };

llvm/lib/TextAPI/RecordVisitor.cpp

@@ -88,5 +88,5 @@ void SymbolConverter::visitObjCInterface(const ObjCInterfaceRecord &ObjCR) {
 }
 
 void SymbolConverter::visitObjCCategory(const ObjCCategoryRecord &Cat) {
-  addIVars(Cat.getObjCIVars(), Cat.getName());
+  addIVars(Cat.getObjCIVars(), Cat.getSuperClassName());
 }