Make HJSArrayLength more likely to have identical GVNs.

src/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 826 matching lines @@
         stub = object->IsString()
             ? isolate()->builtins()->LoadIC_StringLength()
             : isolate()->builtins()->LoadIC_StringWrapperLength();
       } else if (state == MONOMORPHIC && object->IsStringWrapper()) {
         stub = isolate()->builtins()->LoadIC_StringWrapperLength();
       } else if (state != MEGAMORPHIC) {
         stub = megamorphic_stub();
       }
       if (!stub.is_null()) {
         set_target(*stub);
-#ifdef DEBUG
-        if (FLAG_trace_ic) PrintF("[LoadIC : +#length /string]\n");
-#endif
+        TRACE_IC("LoadICStringLength", name, state, target());
       }
       // Get the string if we have a string wrapper object.
       Handle<Object> string = object->IsJSValue()
           ? Handle<Object>(Handle<JSValue>::cast(object)->value())
           : object;
       return Smi::FromInt(String::cast(*string)->length());
     }
 
     // Use specialized code for getting the length of arrays.
     if (object->IsJSArray() &&
         name->Equals(isolate()->heap()->length_symbol())) {
       Handle<Code> stub;
       if (state == UNINITIALIZED) {
         stub = pre_monomorphic_stub();
       } else if (state == PREMONOMORPHIC) {
         stub = isolate()->builtins()->LoadIC_ArrayLength();
       } else if (state != MEGAMORPHIC) {
         stub = megamorphic_stub();
       }
       if (!stub.is_null()) {
         set_target(*stub);
-#ifdef DEBUG
-        if (FLAG_trace_ic) PrintF("[LoadIC : +#length /array]\n");
-#endif
+        TRACE_IC("LoadICArrayLength", name, state, target());
       }
       return JSArray::cast(*object)->length();
     }
 
     // Use specialized code for getting prototype of functions.
     if (object->IsJSFunction() &&
         name->Equals(isolate()->heap()->prototype_symbol()) &&
         Handle<JSFunction>::cast(object)->should_have_prototype()) {
       Handle<Code> stub;
       if (state == UNINITIALIZED) {
@@ skipping 1885 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal