Support %_CallFunction in optimized code.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index a623775f2f8aa68dddb9fbd3c93703321bfde43f..1fbb679bb4bee9dd7ded8afeba39c5dca9d8f152 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -114,6 +114,7 @@ class LChunkBuilder;
   V(HasCachedArrayIndex)                       \
   V(InstanceOf)                                \
   V(InstanceOfKnownGlobal)                     \
+  V(InvokeFunction)                            \
   V(IsNull)                                    \
   V(IsObject)                                  \
   V(IsSmi)                                     \
@@ -1243,6 +1244,23 @@ class HBinaryCall: public HCall<2> {
 };
 
 
+class HInvokeFunction: public HBinaryCall {
+ public:
+  HInvokeFunction(HValue* context, HValue* function, int argument_count)
+      : HBinaryCall(context, function, argument_count) {
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Tagged();
+  }
+
+  HValue* context() { return first(); }
+  HValue* function() { return second(); }
+
+  DECLARE_CONCRETE_INSTRUCTION(InvokeFunction, "invoke_function")
+};
+
+
 class HCallConstantFunction: public HCall<0> {
  public:
   HCallConstantFunction(Handle<JSFunction> function, int argument_count)