Remove now-incorrect DataView accessor optimization

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 386 matching lines @@
       } else if (IsFastElementsKind(map->elements_kind())) {
         field_type = type_cache_.kFixedArrayLengthType;
       } else {
         field_type = type_cache_.kJSArrayLengthType;
       }
     }
     *access_info = PropertyAccessInfo::DataField(Type::Class(map, zone()),
                                                  field_index, field_type);
     return true;
   }
-  // Check for special JSArrayBufferView field accessors.
-  if (Accessors::IsJSArrayBufferViewFieldAccessor(map, name, &offset)) {
-    FieldIndex field_index = FieldIndex::ForInObjectOffset(offset);
-    Type* field_type = Type::Tagged();
-    if (Name::Equals(factory()->byte_length_string(), name) ||
-        Name::Equals(factory()->byte_offset_string(), name)) {
-      // The JSArrayBufferView::byte_length and JSArrayBufferView::byte_offset
-      // properties are always numbers in the range [0, kMaxSafeInteger].
-      field_type = type_cache_.kPositiveSafeInteger;
-    } else if (map->IsJSTypedArrayMap()) {
-      DCHECK(Name::Equals(factory()->length_string(), name));
-      // The JSTypedArray::length property is always a number in the range
-      // [0, kMaxSafeInteger].
-      field_type = type_cache_.kPositiveSafeInteger;
-    }
-    *access_info = PropertyAccessInfo::DataField(
-        Type::Class(map, zone()), field_index, field_type,
-        FieldCheck::kJSArrayBufferViewBufferNotNeutered);
-    return true;
-  }
   return false;
 }
 
 
 bool AccessInfoFactory::LookupTransition(Handle<Map> map, Handle<Name> name,
                                          MaybeHandle<JSObject> holder,
                                          PropertyAccessInfo* access_info) {
   // Check if the {map} has a data transition with the given {name}.
   if (map->unused_property_fields() == 0) return false;
   Handle<Map> transition_map;
@@ skipping 41 matching lines @@
   }
   return false;
 }
 
 
 Factory* AccessInfoFactory::factory() const { return isolate()->factory(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8