Fix remote debugger crash.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index b612c482a96573659a00b382050d54a4c34dd536..1067a38600fa3a1b0ee99248a74c27da3fa85115 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -526,6 +526,8 @@ Handle<Value> Shell::Version(const Arguments& args) {
 
 void Shell::ReportException(v8::TryCatch* try_catch) {
   HandleScope handle_scope;
+  bool enter_context = !Context::InContext();
+  if (enter_context) utility_context_->Enter();
   v8::String::Utf8Value exception(try_catch->Exception());
   const char* exception_string = ToCString(exception);
   Handle<Message> message = try_catch->Message();
@@ -560,6 +562,7 @@ void Shell::ReportException(v8::TryCatch* try_catch) {
     }
   }
   printf("\n");
+  if (enter_context) utility_context_->Exit();
 }