Change end line and column for untyped function defs to line of function definition #12363

Job	Run time
Test mypyc suite with 32-bit Python	7m 7s
Test suite with py38-ubuntu, mypyc-compiled	16m 33s
Test suite with py38-windows-64	19m 47s
Test suite with py39-ubuntu	16m 43s
Test suite with py310-ubuntu	14m 41s
Test suite with py311-ubuntu, mypyc-compiled	15m 2s
Test suite with py312-ubuntu, mypyc-compiled	17m 37s
mypyc runtime tests with py39-macos	5m 12s
mypyc runtime tests with py38-debug-build-ubuntu	4m 34s
Type check our own code (py38-ubuntu)	1m 51s
Type check our own code (py38-windows-64)	2m 55s
Formatting and code style with Black + ruff	40s
	2h 2m 42s

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