Tests

[mypyc] Optimize builtins.repr #15186

Job	Run time
Test mypyc suite with 32-bit Python	7m 40s
Test suite with py39-ubuntu, mypyc-compiled	14m 41s
Test suite with py39-windows-64	21m 24s
Test suite with py310-ubuntu	10m 57s
Test suite with py311-ubuntu, mypyc-compiled	17m 46s
Test suite with py312-ubuntu, mypyc-compiled	13m 40s
Test suite with py313-ubuntu, mypyc-compiled	13m 40s
mypyc runtime tests with py39-macos	5m 14s
Type check our own code (py39-ubuntu)	2m 1s
Type check our own code (py39-windows-64)	2m 51s
Formatting and code style with Black + ruff	1m 53s
	1h 51m 47s

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