[HIP] fix multithreaded access to get_next_driver #3908
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In HIP, we have a pool of Drivers that we use when launching a kernel. If two threads try to launch a kernel at the same time, they could both use the same Driver from the pool. This PR uses a lock to prevent this scenario. I have measured the impact of an uncontested lock using the code in #3670 and I did not see any penalty.