[Intel-gfx] [PATCH i-g-t] igt/gem_exec_await: Tag the final batch in the GTT

[Chris Wilson]

Quoting Chris Wilson (2018-06-07 16:27:22)
> Batches are contained in their position within the GTT by the kernel,
constrained

> and if they are in an invalid poistion will be unbound and rebound
position

> before execution. In our test setup, we therefore need to place the
> batch into a valid poistion within the GTT before we fill the ring with
> busyspinners.