Fix size_t to int conversion compile error.

src/compiler/js-inlining.cc

 // 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.
 
 #include "src/compiler/ast-graph-builder.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/graph-visualizer.h"
 #include "src/compiler/js-inlining.h"
@@ skipping 153 matching lines @@
 
   GenericGraphVisit::Control Post(Node* original) {
     NodeVector inputs(temp_zone_);
     for (InputIter it = original->inputs().begin();
          it != original->inputs().end(); ++it) {
       inputs.push_back(GetCopy(*it));
     }
 
     // Reuse the operator in the copy. This assumes that op lives in a zone
     // that lives longer than graph()'s zone.
-    Node* copy =
-        target_graph_->NewNode(original->op(), inputs.size(), &inputs.front());
+    Node* copy = target_graph_->NewNode(
+        original->op(), static_cast<int>(inputs.size()), &inputs.front());
     copies_[original->id()] = copy;
     return GenericGraphVisit::CONTINUE;
   }
 
   Node* GetCopy(Node* original) {
     Node* copy = copies_[original->id()];
     if (copy == NULL) {
       copy = GetSentinel(original);
     }
     return copy;
@@ skipping 164 matching lines @@
 
   CopyVisitor visitor(&graph, jsgraph_->graph(), info.zone());
   visitor.CopyGraph();
 
   Inlinee inlinee(visitor.GetCopy(graph.start()), visitor.GetCopy(graph.end()));
   inlinee.InlineAtCall(jsgraph_, call);
 }
 }
 }
 }  // namespace v8::internal::compiler