drm/i915/execlists: Refactor out can_merge_rq()
In the next patch, we add another user that wants to check whether requests can be merge into a single HW execution, and in the future we want to add more conditions under which requests from the same context cannot be merge. In preparation, extract out can_merge_rq(). v2: Reorder tests to decide if we can continue filling ELSP and bonus comments. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190208235108.23127-1-chris@chris-wilson.co.uk
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