Alternative approach to using type feedback for Symbol-keyed properties

src/crankshaft/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen-instructions.h"
 
 #include "src/base/bits.h"
 #include "src/base/safe_math.h"
 #include "src/crankshaft/hydrogen-infer-representation.h"
 #include "src/double.h"
@@ skipping 4662 matching lines @@
       os << "%length";
       break;
     case HObjectAccess::kElementsPointer:
       os << "%elements";
       break;
     case HObjectAccess::kMaps:
       os << "%map";
       break;
     case HObjectAccess::kDouble:  // fall through
     case HObjectAccess::kInobject:
-      if (!access.name().is_null()) {
+      if (!access.name().is_null() && access.name()->IsString()) {
         os << Handle<String>::cast(access.name())->ToCString().get();
       }
       os << "[in-object]";
       break;
     case HObjectAccess::kBackingStore:
-      if (!access.name().is_null()) {
+      if (!access.name().is_null() && access.name()->IsString()) {
         os << Handle<String>::cast(access.name())->ToCString().get();
       }
       os << "[backing-store]";
       break;
     case HObjectAccess::kExternalMemory:
       os << "[external-memory]";
       break;
   }
 
   return os << "@" << access.offset();
 }
 
 }  // namespace internal
 }  // namespace v8