Support %_IsUndetectableObject in crankshaft.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 73c46a4403b8a72ddad67077012c8624d33d9608..cb015fd0eca8335a4e6374b3cb4f858817c7b3e7 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -110,10 +110,11 @@ class LChunkBuilder;
   V(InstanceOf)                                \
   V(InstanceOfKnownGlobal)                     \
   V(InvokeFunction)                            \
+  V(IsConstructCall)                           \
   V(IsNull)                                    \
   V(IsObject)                                  \
   V(IsSmi)                                     \
-  V(IsConstructCall)                           \
+  V(IsUndetectable)                            \
   V(JSArrayLength)                             \
   V(LeaveInlined)                              \
   V(LoadContextSlot)                           \
@@ -2465,6 +2466,17 @@ class HIsSmi: public HUnaryPredicate {
 };
 
 
+class HIsUndetectable: public HUnaryPredicate {
+ public:
+  explicit HIsUndetectable(HValue* value) : HUnaryPredicate(value) { }
+
+  DECLARE_CONCRETE_INSTRUCTION(IsUndetectable)
+
+ protected:
+  virtual bool DataEquals(HValue* other) { return true; }
+};
+
+
 class HIsConstructCall: public HTemplateInstruction<0> {
  public:
   HIsConstructCall() {