Make sure tagged binary op instructions change new space promotion.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 36ef717c5dfd0d019450d4748d4e2654fa267b63..2b999840b8e6d3e9f022713dc34a95c7162b5377 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4045,7 +4045,6 @@ class HBitwiseBinaryOperation : public HBinaryOperation {
   }
 
   virtual void RepresentationChanged(Representation to) V8_OVERRIDE {
-    if (to.IsTagged()) SetChangesFlag(kNewSpacePromotion);
     if (to.IsTagged() &&
         (left()->ToNumberCanBeObserved() || right()->ToNumberCanBeObserved())) {
       SetAllSideEffects();
@@ -4054,6 +4053,7 @@ class HBitwiseBinaryOperation : public HBinaryOperation {
       ClearAllSideEffects();
       SetFlag(kUseGVN);
     }
+    if (to.IsTagged()) SetChangesFlag(kNewSpacePromotion);
   }
 
   virtual void UpdateRepresentation(Representation new_rep,
@@ -4119,7 +4119,6 @@ class HArithmeticBinaryOperation : public HBinaryOperation {
   }
 
   virtual void RepresentationChanged(Representation to) V8_OVERRIDE {
-    if (to.IsTagged()) SetChangesFlag(kNewSpacePromotion);
     if (to.IsTagged() &&
         (left()->ToNumberCanBeObserved() || right()->ToNumberCanBeObserved())) {
       SetAllSideEffects();
@@ -4128,6 +4127,7 @@ class HArithmeticBinaryOperation : public HBinaryOperation {
       ClearAllSideEffects();
       SetFlag(kUseGVN);
     }
+    if (to.IsTagged()) SetChangesFlag(kNewSpacePromotion);
   }
 
   DECLARE_ABSTRACT_INSTRUCTION(ArithmeticBinaryOperation)
@@ -4703,10 +4703,6 @@ class HAdd V8_FINAL : public HArithmeticBinaryOperation {
   }
 
   virtual void RepresentationChanged(Representation to) V8_OVERRIDE {
-    if (to.IsTagged()) {
-      SetChangesFlag(kNewSpacePromotion);
-      ClearFlag(kAllowUndefinedAsNaN);
-    }
     if (to.IsTagged() &&
         (left()->ToNumberCanBeObserved() || right()->ToNumberCanBeObserved() ||
          left()->ToStringCanBeObserved() || right()->ToStringCanBeObserved())) {
@@ -4716,6 +4712,10 @@ class HAdd V8_FINAL : public HArithmeticBinaryOperation {
       ClearAllSideEffects();
       SetFlag(kUseGVN);
     }
+    if (to.IsTagged()) {
+      SetChangesFlag(kNewSpacePromotion);
+      ClearFlag(kAllowUndefinedAsNaN);
+    }
   }
 
   virtual Representation RepresentationFromInputs() V8_OVERRIDE;