Bias commutative single-use register inputs and support lea adds

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 490b7805744229e6e02323cf907f9dc947154a26..d7e865d18d99e59fd9fc2695a0d484fc61d0861c 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1370,6 +1370,11 @@ 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->BetterCandidateForRegisterOperand()->UseCount() > 1;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(AddI, "add-i")
   DECLARE_HYDROGEN_ACCESSOR(Add)
 };