Fix gcc 4.9.2 signed-compare 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/js-inlining.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/compiler.h"
 #include "src/compiler/all-nodes.h"
@@ skipping 396 matching lines @@
   CopyVisitor visitor(&graph, jsgraph_->graph(), &zone);
   visitor.CopyGraph();
 
   Node* start = visitor.GetCopy(graph.start());
   Node* end = visitor.GetCopy(graph.end());
   Node* frame_state = call.frame_state();
 
   // Insert argument adaptor frame if required. The callees formal parameter
   // count (i.e. value outputs of start node minus target, receiver & context)
   // have to match the number of arguments passed to the call.
-  DCHECK_EQ(parameter_count, start->op()->ValueOutputCount() - 3);
+  DCHECK_EQ(static_cast<int>(parameter_count),
+            start->op()->ValueOutputCount() - 3);
   if (call.formal_arguments() != parameter_count) {
     frame_state = CreateArgumentsAdaptorFrameState(&call, info.shared_info());
   }
 
   return InlineCall(node, context, frame_state, start, end);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8