Tests

Fix compile on big-endian #19345

Job	Run time
Test mypyc suite with 32-bit Python	8m 53s
Test suite with py39-ubuntu, mypyc-compiled	15m 23s
Test suite with py311-ubuntu	9m 23s
Test suite with py310-ubuntu	12m 33s
Test suite with py312-ubuntu, mypyc-compiled	14m 11s
mypyc runtime tests with py313-macos	5m 0s
Test suite with py314-ubuntu, mypyc-compiled	14m 22s
Test suite with py313-ubuntu, mypyc-compiled	14m 3s
Test suite with py314-windows-64	26m 8s
Type check our own code (py39-ubuntu)	1m 40s
Formatting and code style with Black + ruff	1m 55s
mypyc runtime tests with py310-ubuntu	4m 23s
Type check our own code (py39-windows-64)	2m 3s
	2h 9m 57s

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