Hydrogen: fix keyed loads with string keys

src/ic/ic.h

 // 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.
 
 #ifndef V8_IC_H_
 #define V8_IC_H_
 
 #include "src/ic/ic-state.h"
 #include "src/macro-assembler.h"
 
@@ skipping 441 matching lines @@
 
   static void Clear(Isolate* isolate, Address address, Code* target,
                     ConstantPoolArray* constant_pool);
 
   friend class IC;
 };
 
 
 class KeyedLoadIC : public LoadIC {
  public:
+  // ExtraICState bits (building on IC)
+  class IcCheckTypeField : public BitField<IcCheckType, 1, 1> {};
+
+  static ExtraICState ComputeExtraICState(ContextualMode contextual_mode,
+                                          IcCheckType key_type) {
+    return LoadICState(contextual_mode).GetExtraICState() |
+           IcCheckTypeField::encode(key_type);
+  }
+
+  static IcCheckType GetKeyType(ExtraICState extra_state) {
+    return IcCheckTypeField::decode(extra_state);
+  }
+
   KeyedLoadIC(FrameDepth depth, Isolate* isolate,
               KeyedLoadICNexus* nexus = NULL)
       : LoadIC(depth, isolate, nexus) {
     DCHECK(!FLAG_vector_ics || nexus != NULL);
     DCHECK(target()->is_keyed_load_stub());
   }
 
   MUST_USE_RESULT MaybeHandle<Object> Load(Handle<Object> object,
                                            Handle<Object> key);
 
@@ skipping 289 matching lines @@
 
 // Support functions for interceptor handlers.
 DECLARE_RUNTIME_FUNCTION(LoadPropertyWithInterceptorOnly);
 DECLARE_RUNTIME_FUNCTION(LoadPropertyWithInterceptor);
 DECLARE_RUNTIME_FUNCTION(LoadElementWithInterceptor);
 DECLARE_RUNTIME_FUNCTION(StorePropertyWithInterceptor);
 }
 }  // namespace v8::internal
 
 #endif  // V8_IC_H_