Generate better branch code for instanceof-predicates.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 8287)
+++ src/hydrogen-instructions.h	(working copy)
@@ -2789,14 +2789,12 @@
   HValue* left() { return OperandAt(1); }
   HValue* right() { return OperandAt(2); }
 
-  virtual bool EmitAtUses() {
-    return !HasSideEffects() && !HasMultipleUses();
-  }
-
   virtual Representation RequiredInputRepresentation(int index) const {
     return Representation::Tagged();
   }
 
+  virtual HType CalculateInferredType();
+
   virtual void PrintDataTo(StringStream* stream);
 
   DECLARE_CONCRETE_INSTRUCTION(InstanceOf)
@@ -2817,6 +2815,8 @@
     return Representation::Tagged();
   }
 
+  virtual HType CalculateInferredType();
+
   DECLARE_CONCRETE_INSTRUCTION(InstanceOfKnownGlobal)
 
  private:
@@ -4005,6 +4005,8 @@
     return Representation::Tagged();
   }
 
+  virtual HType CalculateInferredType();
+
   DECLARE_CONCRETE_INSTRUCTION(DeleteProperty)
 
   HValue* object() { return left(); }