Tweak the Better{Left,Right}Operand() heuristic

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 2855e8a1409dc0063eab06e52b21a6e755aa6219..775a1333a99a0beadba1ee7db9428696f5bdde71 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -4030,6 +4030,14 @@ bool HValue::HasNonSmiUse() {
 }
 
 
+bool HValue::UsedBy(HValue* value) {
+  for (HUseIterator it(uses()); !it.Done(); it.Advance()) {
+    if (it.value() == value) return true;
+  }
+  return false;
+}
+
+
 // Node-specific verification code is only included in debug mode.
 #ifdef DEBUG