Type ignore comments erroneously marked as unused by dmypy #11887

Job	Run time
Test mypyc suite with 32-bit Python	8m 28s
Test suite with py38-ubuntu, mypyc-compiled	20m 46s
Test suite with py38-windows-64	26m 33s
Test suite with py39-ubuntu	19m 29s
Test suite with py310-ubuntu	18m 10s
Test suite with py311-ubuntu, mypyc-compiled	18m 34s
Test suite with py312-ubuntu, mypyc-compiled	20m 36s
mypyc runtime tests with py39-macos	5m 14s
mypyc runtime tests with py38-debug-build-ubuntu	5m 35s
Type check our own code (py38-ubuntu)	1m 50s
Type check our own code (py38-windows-64)	2m 25s
Formatting and code style with Black + ruff	34s
	2h 28m 14s

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