Tests

[mypyc] fix: Final load in unreachable branches #20255

Job	Run time
Test mypyc suite with 32-bit Python	6m 58s
Test suite with py314-ubuntu, mypyc-compiled	1m 11s
Test suite with py311-ubuntu	6m 55s
Test suite with py310-ubuntu, mypyc-compiled	1m 12s
Test suite with py314-windows-64	6m 54s
Test suite with py312-ubuntu	6m 54s
mypyc runtime tests with py310-ubuntu	5m 54s
Test suite with py313-ubuntu, mypyc-compiled	1m 4s
Test suite with py314t-ubuntu, mypyc-compiled	1m 21s
Type check our own code (py310-ubuntu)	1m 32s
Parallel tests with py314-ubuntu, interpreted	6m 55s
Formatting and code style with Black + ruff	1m 58s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 5s
Type check our own code (py310-windows-64)	2m 15s
mypyc runtime tests with py313-macos	6m 44s
	58m 52s

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