Fix speedup of typedarray-length loading in the ICs as well as Crankshaft

src/ic/ic.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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 1201 matching lines @@
       // Perform a lookup behind the interceptor. Copy the LookupIterator since
       // the original iterator will be used to fetch the value.
       LookupIterator it = *lookup;
       it.Next();
       LookupForRead(&it);
       return compiler.CompileLoadInterceptor(&it);
     }
 
     case LookupIterator::ACCESSOR: {
       // Use simple field loads for some well-known callback properties.
-      if (receiver_is_holder) {
-        DCHECK(receiver->IsJSObject());
-        Handle<JSObject> js_receiver = Handle<JSObject>::cast(receiver);
-        int object_offset;
-        if (Accessors::IsJSObjectFieldAccessor(map, lookup->name(),
-                                               &object_offset)) {
-          FieldIndex index =
-              FieldIndex::ForInObjectOffset(object_offset, js_receiver->map());
-          return SimpleFieldLoad(index);
-        }
+      // The method will only return true for absolute truths based on the
+      // receiver maps.
+      int object_offset;
+      if (Accessors::IsJSObjectFieldAccessor(map, lookup->name(),
+                                             &object_offset)) {
+        FieldIndex index = FieldIndex::ForInObjectOffset(object_offset, *map);
+        return SimpleFieldLoad(index);
       }
 
       Handle<Object> accessors = lookup->GetAccessors();
       if (accessors->IsExecutableAccessorInfo()) {
         Handle<ExecutableAccessorInfo> info =
             Handle<ExecutableAccessorInfo>::cast(accessors);
         if (v8::ToCData<Address>(info->getter()) == 0) break;
         if (!ExecutableAccessorInfo::IsCompatibleReceiverMap(isolate(), info,
                                                              map)) {
           break;
@@ skipping 1806 matching lines @@
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR) NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
 }
 }  // namespace v8::internal