Tests

Typecheck unreachable code #15024

Job	Run time
Test mypyc suite with 32-bit Python	7m 26s
Test suite with py39-ubuntu, mypyc-compiled	19m 27s
Test suite with py39-windows-64	21m 20s
Test suite with py310-ubuntu	13m 8s
Test suite with py311-ubuntu, mypyc-compiled	17m 16s
Test suite with py312-ubuntu, mypyc-compiled	20m 58s
Test suite with py313-ubuntu, mypyc-compiled	19m 49s
mypyc runtime tests with py39-macos	4m 5s
Type check our own code (py39-ubuntu)	1m 59s
Type check our own code (py39-windows-64)	3m 18s
Formatting and code style with Black + ruff	1m 41s
	2h 10m 27s

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