New issue 2443: Hyperblock scheduling
PyPy has poor performance on workloads with a large number of unbiased
branches, due to poor inter-trace optimizations.
Hyperblock scheduling solves this problem by merging several traces into a
single combined trace. See [LuaJIT's issue
37](https://github.com/LuaJIT/LuaJIT/issues/37) for more information.
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