Fix to allocation stub invalidation: we cannot just remove it as it will be collected even though c…

runtime/vm/raw_object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/globals.h"
@@ skipping 524 matching lines @@
   RawTypeArguments* type_parameters_;  // Array of TypeParameter.
   RawAbstractType* super_type_;
   RawType* mixin_;  // Generic mixin type, e.g. M<T>, not M<int>.
   RawClass* patch_class_;
   RawFunction* signature_function_;  // Associated function for signature class.
   RawArray* constants_;  // Canonicalized values of this class.
   RawObject* canonical_types_;  // An array of canonicalized types of this class
                                 // or the canonical type.
   RawArray* invocation_dispatcher_cache_;  // Cache for dispatcher functions.
   RawArray* cha_codes_;  // CHA optimized codes.
+  RawCode* spare_allocation_stub_;  // Spare stub code for allocation.
   RawCode* allocation_stub_;  // Stub code for allocation of instances.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->allocation_stub_);
   }
 
   cpp_vtable handle_vtable_;
   int32_t id_;  // Class Id, also index in the class table.
   int32_t token_pos_;
   int32_t instance_size_in_words_;  // Size if fixed len or 0 if variable len.
   int32_t type_arguments_field_offset_in_words_;  // Offset of type args fld.
@@ skipping 1499 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_