Add JSGraph::GetCachedNodes and NodeCache::GetCachedNodes. These routines are necessary in the dead…

src/compiler/common-node-cache.h

 // Copyright 2014 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_COMPILER_COMMON_NODE_CACHE_H_
 #define V8_COMPILER_COMMON_NODE_CACHE_H_
 
 #include "src/assembler.h"
 #include "src/compiler/node-cache.h"
 
@@ skipping 23 matching lines @@
     return external_constants_.Find(zone_, reference.address());
   }
 
   Node** FindNumberConstant(double value) {
     // We canonicalize double constants at the bit representation level.
     return number_constants_.Find(zone_, bit_cast<int64_t>(value));
   }
 
   Zone* zone() const { return zone_; }
 
+  void GetCachedNodes(NodeVector* nodes) {
+    int32_constants_.GetCachedNodes(nodes);
+    int64_constants_.GetCachedNodes(nodes);
+    float64_constants_.GetCachedNodes(nodes);
+    external_constants_.GetCachedNodes(nodes);
+    number_constants_.GetCachedNodes(nodes);
+  }
+
  private:
   Int32NodeCache int32_constants_;
   Int64NodeCache int64_constants_;
   Int64NodeCache float64_constants_;
   PtrNodeCache external_constants_;
   Int64NodeCache number_constants_;
   Zone* zone_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_NODE_CACHE_H_