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In old style, if we run in fork-and-exec mode, `staticCnt` will starts
from zero for each run. So for example `__sanitizer_cov_trace_cmp4` will
only be executed at the 4096th time...
If the target is small to have 4096 cmp during execution,
`__sanitizer_cov_trace_cmp4` trick will never work.
Even if the target is big, the old style is still inbalanced.
So just make it random.
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