[SYCL] Don't return last event in ext_oneapi_submit_barrier
#20235
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…20159) **Problem** As an optimization in `ext_oneapi_submit_barrier`, for in-order queue, when waitlist is empty, we return the last event, if it is available. However, after intel#18277, we no longer store last event and instead submit a marker to get the last event. And this caused performance regression in some of our internal benchmarks. **Solution** Don't return last event and instead submit a barrier with empty waitlist.
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uditagarwal97
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uditagarwal97
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This is a cherry-pick of #20159
Problem
As an optimization in
ext_oneapi_submit_barrier, for in-order queue, when waitlist is empty, we return the last event, if it is available. However, after #18277, we no longer store last event and instead submit a marker to get the last event. And this caused performance regression in some of our internal benchmarks.Solution
Don't return last event and instead submit a barrier with empty waitlist.