Fixed breakage caused by r11051 on non-ia32 platforms.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 9699c9ed48ba7a52c380caa4ef355c9c95bd009d..85c5e758c0b325753cea2f9d2ef141f3004eab17 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -1466,10 +1466,10 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         }
         break;
       case ObjectLiteral::Property::GETTER:
-        accessor_table.find(key)->second->getter = value;
+        accessor_table.lookup(key)->second->getter = value;
         break;
       case ObjectLiteral::Property::SETTER:
-        accessor_table.find(key)->second->setter = value;
+        accessor_table.lookup(key)->second->setter = value;
         break;
     }
   }