[crankshaft] Always force number representation for increment.

src/crankshaft/hydrogen.h

Index: src/crankshaft/hydrogen.h
diff --git a/src/crankshaft/hydrogen.h b/src/crankshaft/hydrogen.h
index 3a7584c225f3e4ccdd546a086184f6a1b806428b..042d6367607724ee43a49757c52ac9d7786c8c63 100644
--- a/src/crankshaft/hydrogen.h
+++ b/src/crankshaft/hydrogen.h
@@ -2687,8 +2687,7 @@ class HOptimizedGraphBuilder : public HGraphBuilder,
       HValue* left,
       HValue* right,
       PushBeforeSimulateBehavior push_sim_result);
-  HInstruction* BuildIncrement(bool returns_original_input,
-                               CountOperation* expr);
+  HInstruction* BuildIncrement(CountOperation* expr);
   HInstruction* BuildKeyedGeneric(PropertyAccessType access_type,
                                   Expression* expr, FeedbackVectorSlot slot,
                                   HValue* object, HValue* key, HValue* value);