Tests

Avoid treating `pass` and `...` as no-op for reachability #20055

Job	Run time
Test mypyc suite with 32-bit Python	9m 30s
Test suite with py312-ubuntu	10m 1s
Test suite with py311-ubuntu	9m 6s
Test suite with py314t-ubuntu, mypyc-compiled	16m 3s
Test suite with py310-ubuntu, mypyc-compiled	13m 53s
Test suite with py313-ubuntu, mypyc-compiled	14m 20s
Test suite with py314-windows-64	20m 36s
mypyc runtime tests with py310-ubuntu	5m 17s
Type check our own code (py310-ubuntu)	1m 43s
Parallel tests with py314-ubuntu, mypyc-compiled	20m 40s
Test suite with py314-ubuntu, mypyc-compiled	14m 17s
Parallel tests with py314-ubuntu, interpreted	20m 39s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py310-windows-64)	2m 20s
mypyc runtime tests with py313-macos	4m 18s
	2h 44m 38s

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