Minor cleanup.

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 10893 matching lines @@
 RawObject* Namespace::Lookup(const String& name) const {
   Zone* zone = Thread::Current()->zone();
   const Library& lib = Library::Handle(zone, library());
   intptr_t ignore = 0;
 
   // Lookup the name in the library's symbols.
   Object& obj = Object::Handle(zone, lib.LookupEntry(name, &ignore));
   if (!Field::IsGetterName(name) &&
       !Field::IsSetterName(name) &&
       (obj.IsNull() || obj.IsLibraryPrefix())) {
-    const String& getter_name = String::Handle(Field::LookupGetterSymbol(name));
-    if (!getter_name.IsNull()) {
-      obj = lib.LookupEntry(getter_name, &ignore);
+    String& accessor_name = String::Handle(zone);
+    accessor_name ^= Field::LookupGetterSymbol(name);
+    if (!accessor_name.IsNull()) {
+      obj = lib.LookupEntry(accessor_name, &ignore);
     }
     if (obj.IsNull()) {
-      const String& setter_name =
-          String::Handle(Field::LookupSetterSymbol(name));
-      if (!setter_name.IsNull()) {
-        obj = lib.LookupEntry(setter_name, &ignore);
+      accessor_name ^= Field::LookupSetterSymbol(name);
+      if (!accessor_name.IsNull()) {
+        obj = lib.LookupEntry(accessor_name, &ignore);
       }
     }
   }
 
   // Library prefixes are not exported.
   if (obj.IsNull() || obj.IsLibraryPrefix()) {
     // Lookup in the re-exported symbols.
     obj = lib.LookupReExport(name);
     if (obj.IsNull() && !Field::IsSetterName(name)) {
       // LookupReExport() only returns objects that match the given name.
       // If there is no field/func/getter, try finding a setter.
       const String& setter_name =
-          String::Handle(Field::LookupSetterSymbol(name));
+          String::Handle(zone, Field::LookupSetterSymbol(name));
       if (!setter_name.IsNull()) {
         obj = lib.LookupReExport(setter_name);
       }
     }
   }
   if (obj.IsNull() || HidesName(name) || obj.IsLibraryPrefix()) {
     return Object::null();
   }
   return obj.raw();
 }
@@ skipping 10951 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart