Fix missing tagging of stack value in finally block.

test/cctest/test-api.cc

 // 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 16838 matching lines @@
 
   // Turn monomorphic on slow object with native accessor, then just
   // delete the property and fail.
   CompileRun("function f(x) { return x.foo; }"
              "%OptimizeObjectForAddingMultipleProperties(obj, 1);"
              "obj.__proto__ = null;"
              "f(obj); f(obj); delete obj.foo;"
              "var result = f(obj);");
   CHECK(context->Global()->Get(v8_str("result"))->IsUndefined());
 }
+
+
+THREADED_TEST(Regress137496) {
+  i::FLAG_expose_gc = true;
+  v8::HandleScope scope;
+  LocalContext context;
+
+  // Compile a try-finally clause where the finally block causes a GC
+  // while there still is a message pending for external reporting.
+  TryCatch try_catch;
+  try_catch.SetVerbose(true);
+  CompileRun("try { throw new Error(); } finally { gc(); }");
+  CHECK(try_catch.HasCaught());
+}