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

The hash in the crash message is necessary to keep cluster fuzz from
grouping all result mismatches.

R=titzer@chromium.org, mmoroz@chromium.org

Review-Url: https://codereview.chromium.org/2363663002
Cr-Commit-Position: refs/heads/master@{#39625}

test/fuzzer/wasm-code.cc

@@ -7,6 +7,7 @@
 
 #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"
@@ -14,6 +15,8 @@
 #include "test/common/wasm/wasm-module-runner.h"
 #include "test/fuzzer/fuzzer-support.h"
 
+#define WASM_CODE_FUZZER_HASH_SEED 83
+
 using namespace v8::internal::wasm;
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
@@ -92,6 +95,14 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
     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), WASM_CODE_FUZZER_HASH_SEED));
+    }
     CHECK_EQ(result_interpreted, result_compiled);
   }
   return 0;