Catch graceful failures when deserializing in d8.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 41b5fa75fbb3d0bbfe971d54c26359d62ee5a60a..246c17fae4815db05505eaac748eb13cb123eb1d 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -249,10 +249,13 @@ Local<Script> Shell::CompileString(
     DCHECK(false);  // A new compile option?
   }
   if (data == NULL) compile_options = ScriptCompiler::kNoCompileOptions;
-  return source_type == SCRIPT
-             ? ScriptCompiler::Compile(isolate, &cached_source, compile_options)
-             : ScriptCompiler::CompileModule(isolate, &cached_source,
-                                             compile_options);
+  Local<Script> result =
+      source_type == SCRIPT
+          ? ScriptCompiler::Compile(isolate, &cached_source, compile_options)
+          : ScriptCompiler::CompileModule(isolate, &cached_source,
+                                          compile_options);
+  CHECK(data == NULL || !data->rejected);
+  return result;
 }