Handle external reference values properly in HConstant::ImmortalImmovable().

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3194 matching lines @@
   bool ImmortalImmovable() const {
     if (has_int32_value_) {
       return false;
     }
     if (has_double_value_) {
       if (IsSpecialDouble()) {
         return true;
       }
       return false;
     }
+    if (has_external_reference_value_) {
+      return false;
+    }
 
     ASSERT(!handle_.is_null());
     Heap* heap = isolate()->heap();
     ASSERT(unique_id_ != UniqueValueId(heap->minus_zero_value()));
     ASSERT(unique_id_ != UniqueValueId(heap->nan_value()));
     return unique_id_ == UniqueValueId(heap->undefined_value()) ||
            unique_id_ == UniqueValueId(heap->null_value()) ||
            unique_id_ == UniqueValueId(heap->true_value()) ||
            unique_id_ == UniqueValueId(heap->false_value()) ||
            unique_id_ == UniqueValueId(heap->the_hole_value()) ||
@@ skipping 3521 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_