Fix clang/win build.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 587afd72453e068ce165942682a21740fbc4d64c..0d014a503e2d8a6aef5f47106e349f7d15e0fdbc 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -382,7 +382,7 @@ void InstructionSelector::InitializeCallBuffer(Node* call, CallBuffer* buffer,
     DCHECK(deopt_node == NULL);
   }
 
-  DCHECK(input_count ==
+  DCHECK(static_cast<size_t>(input_count) ==
          (buffer->instruction_args.size() - buffer->control_count() +
           buffer->pushed_nodes.size() - buffer->frame_state_value_count()));
 }