Two microbenchmarks: [sieve](https://github.com/mypyc/mypyc-benchmark-results/blob/master/reports/benchmarks/sieve.md) and [int_list](https://github.com/mypyc/mypyc-benchmark-results/blob/master/reports/benchmarks/int_list.md) has significant performance regression on commit https://github.com/python/mypy/commit/be01236bcdb9a9da66e68dd0d45ff0f9a604e44a. [bytes_format](https://github.com/mypyc/mypyc-benchmark-results/blob/master/reports/benchmarks/bytes_format.md) has a significant regression on commit: https://github.com/python/mypy/commit/b98c47edf204c9abce27aa10a99b943f3fb857dc