[turbofan] Finish support for holey double elements backing stores.

src/compiler/access-info.cc

 // Copyright 2015 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 <ostream>
 
 #include "src/accessors.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-info.h"
 #include "src/field-index-inl.h"
@@ skipping 123 matching lines @@
       type_cache_(TypeCache::Get()),
       zone_(zone) {}
 
 
 bool AccessInfoFactory::ComputeElementAccessInfo(
     Handle<Map> map, AccessMode access_mode, ElementAccessInfo* access_info) {
   // Check if it is safe to inline element access for the {map}.
   if (!CanInlineElementAccess(map)) return false;
 
   ElementsKind const elements_kind = map->elements_kind();
-  if (access_mode == AccessMode::kLoad &&
-      elements_kind == FAST_HOLEY_DOUBLE_ELEMENTS) {
-    // TODO(bmeurer): Add support for holey loads.
-    return false;
-  }
 
   // Certain (monomorphic) stores need a prototype chain check because shape
   // changes could allow callbacks on elements in the chain that are not
   // compatible with monomorphic keyed stores.
   MaybeHandle<JSObject> holder;
   if (access_mode == AccessMode::kStore && map->prototype()->IsJSObject()) {
     for (PrototypeIterator i(map); !i.IsAtEnd(); i.Advance()) {
       Handle<JSReceiver> prototype =
           PrototypeIterator::GetCurrent<JSReceiver>(i);
       if (!prototype->IsJSObject()) return false;
@@ skipping 293 matching lines @@
   }
   return false;
 }
 
 
 Factory* AccessInfoFactory::factory() const { return isolate()->factory(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8