Show line and column with anonymous files.

This matches the [behavior of Node.js](https://github.com/joyent/node/blob/f230a1cf749e984439b5bb9729d9db9f48472827/deps/v8/src/messages.js#L947-L950).

I tried to create a test case for this (other than my whole application) and failed.  I'm open to suggestions.