Rollback of r14587 in trunk branch.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index d1f7e76084af75c1b3115f35d6caf63daaeec8ff..da61f32f810f84976d00e4627b917869d6fd91a5 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1345,11 +1345,6 @@ class LAddI: public LTemplateInstruction<1, 2, 0> {
   LOperand* left() { return inputs_[0]; }
   LOperand* right() { return inputs_[1]; }
 
-  static bool UseLea(HAdd* add) {
-    return !add->CheckFlag(HValue::kCanOverflow) &&
-        add->BetterLeftOperand()->UseCount() > 1;
-  }
-
   DECLARE_CONCRETE_INSTRUCTION(AddI, "add-i")
   DECLARE_HYDROGEN_ACCESSOR(Add)
 };