Change end line and column for untyped function defs to line of function definition #12359

Job	Run time
Test mypyc suite with 32-bit Python	7m 9s
Test suite with py38-ubuntu, mypyc-compiled	17m 11s
Test suite with py38-windows-64	19m 54s
Test suite with py39-ubuntu	16m 39s
Test suite with py310-ubuntu	15m 11s
Test suite with py311-ubuntu, mypyc-compiled	15m 35s
Test suite with py312-ubuntu, mypyc-compiled	17m 24s
mypyc runtime tests with py39-macos	6m 12s
mypyc runtime tests with py38-debug-build-ubuntu	4m 54s
Type check our own code (py38-ubuntu)	1m 47s
Type check our own code (py38-windows-64)	2m 26s
Formatting and code style with Black + ruff	39s
	2h 5m 1s

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