TEST: Fix missing type store for overloads #264

Job	Run time
Test mypyc suite with 32-bit Python	7m 56s
Test suite with py38-ubuntu, mypyc-compiled	20m 8s
Test suite with py38-windows-64	26m 21s
Test suite with py39-ubuntu	18m 39s
Test suite with py310-ubuntu	18m 8s
Test suite with py311-ubuntu, mypyc-compiled	17m 11s
Test suite with py312-ubuntu, mypyc-compiled	20m 0s
mypyc runtime tests with py39-macos	9m 26s
mypyc runtime tests with py38-debug-build-ubuntu	5m 31s
Type check our own code (py38-ubuntu)	1m 44s
Type check our own code (py38-windows-64)	2m 28s
Formatting and code style with Black + ruff	35s
	2h 28m 7s

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