Performance regression on Ubuntu 22.0 with ROCm 5.4.3/5.4.5/5.5 and latest gpuOwl version, exponent 114710069

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ROCm 5.4.3: GPU Radeon VII us/it 772

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ROCm 5.4.5: GPU Radeon VII us/it 775

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Getting worse: ROCm 5.5: GPU Radeon VII us/it 797

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ROCm 5.5.1: GPU Radeon VII us/it 799

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ROCm 5.6: GPU Radeon VII (with barrier CLK_LOCAL_MEM_FENCE) us/it 1233 (with barrier 0) us/it 1206

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I'm stopping Mersenne search with gpuOwl until it is Re-optimized.

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ROCm 5.6.1: Radeon VII Still 1206 us/it for the same exponent.

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ROCm 5.7.0: Radeon VII Performance Back To Normal 786 us/it.

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ROCm 5.7.0: Radeon VII Performance Back To Normal 783 us/it with barrier(0) instead of CLK_LOCAL_MEM_FENCE.