Make Event::PollForStatus a virtual method, and override it where necessary. #68349
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Make Event::PollForStatus a virtual method, and override it where necessary.
This enables Event to be a completely virtual base class, and removes it from circular dependencies.
FUTURE_COPYBARA_INTEGRATE_REVIEW=openxla/xla#12942 from openxla:fix_test_cudnn c438b08ea7240c23ae98bc8dcf4ef45fa6d2e89c