Reland "Soft fail for invalid cache data."

test/cctest/test-serialize.cc

Index: test/cctest/test-serialize.cc
diff --git a/test/cctest/test-serialize.cc b/test/cctest/test-serialize.cc
index fbd7fcfad90ce8a5339ed9aa2bcd6963221ea614..2acaabcd077de679a8bc5f05e12d0ae985240cc1 100644
--- a/test/cctest/test-serialize.cc
+++ b/test/cctest/test-serialize.cc
@@ -1231,6 +1231,7 @@ TEST(SerializeToplevelIsolates) {
       script = v8::ScriptCompiler::CompileUnbound(
           isolate2, &source, v8::ScriptCompiler::kConsumeCodeCache);
     }
+    CHECK(!cache->rejected);
     v8::Local<v8::Value> result = script->BindToCurrentContext()->Run();
     CHECK(result->ToString()->Equals(v8_str("abcdef")));
   }