[wasm] test deserialization when header is invalid

src/snapshot/code-serializer.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_SNAPSHOT_CODE_SERIALIZER_H_
 #define V8_SNAPSHOT_CODE_SERIALIZER_H_
 
 #include "src/parsing/preparse-data.h"
 #include "src/snapshot/serializer.h"
 
@@ skipping 95 matching lines @@
 
   // Return ScriptData object and relinquish ownership over it to the caller.
   ScriptData* GetScriptData();
 
   Vector<const Reservation> Reservations() const;
   Vector<const byte> Payload() const;
 
   Vector<const uint32_t> CodeStubKeys() const;
 
   static uint32_t SourceHash(Handle<String> source);
+  static void InvalidateVersionForTest(byte* buffer, size_t buffer_size);
 
  private:
   explicit SerializedCodeData(ScriptData* data);
   SerializedCodeData(const byte* data, int size)
       : SerializedData(const_cast<byte*>(data), size) {}
 
   Vector<const byte> DataWithoutHeader() const {
     return Vector<const byte>(data_ + kHeaderSize, size_ - kHeaderSize);
   }
 
@@ skipping 22 matching lines @@
   static const int kPayloadLengthOffset = kNumCodeStubKeysOffset + kInt32Size;
   static const int kChecksum1Offset = kPayloadLengthOffset + kInt32Size;
   static const int kChecksum2Offset = kChecksum1Offset + kInt32Size;
   static const int kHeaderSize = kChecksum2Offset + kInt32Size;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_CODE_SERIALIZER_H_