tests: Add a test for arrays with an expression as the index.
See https://bugs.winehq.org/show_bug.cgi?id=54832
I'm starting to see this particular FIXME in quite a few games (Escape Goat 2, Murder Miners, and Little Racers STREET to name a few), and since I'm not sure how to fix this I figured I could at least provide a test for someone that knows more SM4 than me :P