[wasm] Add hash to the crash message of the correctness fuzzer.

test/fuzzer/wasm-code.cc

 // 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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "include/v8.h"
 #include "src/isolate.h"
+#include "src/objects.h"
 #include "src/wasm/encoder.h"
 #include "src/wasm/wasm-interpreter.h"
 #include "src/wasm/wasm-module.h"
 #include "test/cctest/wasm/test-signatures.h"
 #include "test/common/wasm/wasm-module-runner.h"
 #include "test/fuzzer/fuzzer-support.h"
 
 using namespace v8::internal::wasm;
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
@@ skipping 65 matching lines @@
         v8::internal::handle(v8::internal::Smi::FromInt(2), i_isolate),
         v8::internal::handle(v8::internal::Smi::FromInt(3), i_isolate)};
     result_compiled = testing::CallWasmFunctionForTesting(
         i_isolate, instance, &compiler_thrower, "main", arraysize(arguments),
         arguments, v8::internal::wasm::ModuleOrigin::kWasmOrigin);
   }
   if (result_interpreted == 0xdeadbeef) {
     CHECK(i_isolate->has_pending_exception());
     i_isolate->clear_pending_exception();
   } else {
+    if (result_interpreted != result_compiled) {
+      V8_Fatal(
+          __FILE__, __LINE__,
+          "Interpreter result (%d) != compiled module result (%d). Hash: %u",
+          result_interpreted, result_compiled,
+          v8::internal::StringHasher::HashSequentialString(
+              data, static_cast<int>(size), 83));

[titzer, 2016/09/22 09:54:17]

what is 83? the seed? Maybe add a constant here.

+    }
     CHECK_EQ(result_interpreted, result_compiled);
   }
   return 0;
 }