Only update POLYMORPHIC stubs using other POLYMORPHIC or GENERIC stubs.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index cea308b28636ffea5a6767e55472d376eeba821c..ea6aa057dfbd40cf889140c88baf5027cdba8b93 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -179,6 +179,14 @@ class IC {
     UNREACHABLE();
     return Handle<Code>::null();
   }
+  virtual Handle<Code> generic_stub() const {
+    UNREACHABLE();
+    return Handle<Code>::null();
+  }
+  virtual Handle<Code> generic_stub_strict() const {
+    UNREACHABLE();
+    return Handle<Code>::null();
+  }
 
  private:
   // Frame pointer for the frame that uses (calls) the IC.