[ROCm] miopen benchmark behavior now better aligns with cudnn #1851
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The default benchmark setting is now false. The new miopen behavior means when benchmarking is disabled, for any shape that doesn't have a find hit, then it will do a quick search (same behavior as the prior default), and use that result. Now when benchmark is enabled, it will perform an exhaustive search and update any DBs. miopen immediate mode is still available and is used when deterministic is true and benchmark is false.