igt/gem_mmap_wc: Explicitly check for use-after-close

We already rely on the mmap(object) surviving close(), but make the test
explicit and early.

Secondly, we don't technically need to call set_domain after writing
through the CPU then reading through WC, since the CPU cache is
consistent for those two paths. Test it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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