Revert "Revert "Reland 21774: Generate KeyedLoadGeneric with Hydrogen""

src/heap.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_HEAP_H_
 #define V8_HEAP_H_
 
 #include <cmath>
 
 #include "src/allocation.h"
@@ skipping 2386 matching lines @@
   void Update(Handle<Map> map, Handle<Name> name, int field_offset);
 
   // Clear the cache.
   void Clear();
 
   static const int kLength = 256;
   static const int kCapacityMask = kLength - 1;
   static const int kMapHashShift = 5;
   static const int kHashMask = -4;  // Zero the last two bits.
   static const int kEntriesPerBucket = 4;
+  static const int kEntryLength = 2;
+  static const int kMapIndex = 0;
+  static const int kKeyIndex = 1;
   static const int kNotFound = -1;
 
   // kEntriesPerBucket should be a power of 2.
   STATIC_ASSERT((kEntriesPerBucket & (kEntriesPerBucket - 1)) == 0);
   STATIC_ASSERT(kEntriesPerBucket == -kHashMask);
 
  private:
   KeyedLookupCache() {
     for (int i = 0; i < kLength; ++i) {
       keys_[i].map = NULL;
@@ skipping 363 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_