JIT

gh-111178: fix UBSan failures for `_PyExecutorObject` #2992

Job	Run time
Interpreter (Debug)	8m 54s
Free-Threaded (Debug) (19)	13m 34s
i686-pc-windows-msvc/msvc (Debug)	3m 28s
i686-pc-windows-msvc/msvc (Release)	11m 51s
x86_64-pc-windows-msvc/msvc (Debug)	19m 51s
x86_64-pc-windows-msvc/msvc (Release)	12m 19s
aarch64-pc-windows-msvc/msvc (Debug)	5m 27s
aarch64-pc-windows-msvc/msvc (Release)	6m 51s
x86_64-apple-darwin/clang (Debug)	12m 58s
x86_64-apple-darwin/clang (Release)	8m 32s
aarch64-apple-darwin/clang (Debug)	8m 59s
aarch64-apple-darwin/clang (Release)	8m 25s
x86_64-unknown-linux-gnu/gcc (Debug)	9m 53s
x86_64-unknown-linux-gnu/gcc (Release)	5m 59s
aarch64-unknown-linux-gnu/gcc (Debug)	10m 12s
aarch64-unknown-linux-gnu/gcc (Release)	6m 17s
	2h 33m 30s

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