lima/gpir: Fix postlog2 fixup handling

lima/gpir: Fix postlog2 fixup handling

We guarantee that a complex1 op is always used by postlog2 directly by
rewriting the postlog2 op to be a move when there would be a move
inserted between them. But we weren't doing this in all circumstances
where there might be a move. Move the logic to place_move() so that it
always happens. Fixes a few log tests that happened to start failing due
to changes in the register allocator leading to a different scheduling
order.

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>