JIT IR: Fix typo breaking reordering

This was it, just a typo.  Darn, wish I'd just noticed it with my eyes rather than debugging.

Actually, there are dead stores in some games, for example Star Ocean, which I didn't even see any branches to.  We could probably eliminate them branch or no branch in IR as well.  Not sure how common, though...

Note: pull to jit-ir.

-[Unknown]