Defer creating Handles for HConstants to the code generation phase.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index abaa4401b4f7ba8a44a7d40d0182a7331757bf8d..05fd904c32d12b3b59dbc3c95f6ee5bfff3a12ed 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -287,6 +287,8 @@ class HGraph: public ZoneObject {
     undefined_constant_.set(constant);
   }
   HConstant* GetConstantUndefined() const { return undefined_constant_.get(); }
+  HConstant* GetConstantInt32(SetOncePointer<HConstant>* pointer,
+                              int32_t integer_value);
   HConstant* GetConstant1();
   HConstant* GetConstantMinus1();
   HConstant* GetConstantTrue();
@@ -298,6 +300,15 @@ class HGraph: public ZoneObject {
     return arguments_object_.get();
   }
 
+  void EnsureConstantsHaveHandles() {
+    Factory* factory = isolate()->factory();
+    for (int i = 0; i < values_.length(); i++) {
+      if (values_[i]->IsConstant()) {
+        HConstant::cast(values_[i])->EnsureHasHandle(factory);
+      }
+    }
+  }
+
   void SetArgumentsObject(HArgumentsObject* object) {
     arguments_object_.set(object);
   }
@@ -1182,6 +1193,9 @@ class HGraphBuilder: public AstVisitor {
 
   bool inline_bailout_;
 
+  HConstant* constant_undefined_;
+  HConstant* constant_null_;
+
   friend class FunctionState;  // Pushes and pops the state stack.
   friend class AstContext;  // Pushes and pops the AST context stack.