JIT

gh-117486: Improve behavior for user-defined AST subclasses #17

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	17m 15s
i686-pc-windows-msvc/msvc (Release)	21m 46s
x86_64-pc-windows-msvc/msvc (Debug)	18m 58s
x86_64-pc-windows-msvc/msvc (Release)	22m 55s
aarch64-pc-windows-msvc/msvc (Debug)	4m 25s
aarch64-pc-windows-msvc/msvc (Release)	5m 17s
x86_64-apple-darwin/clang (Debug)	11m 9s
x86_64-apple-darwin/clang (Release)	17m 5s
aarch64-apple-darwin/clang (Debug)	8m 32s
aarch64-apple-darwin/clang (Release)	13m 30s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 11s
x86_64-unknown-linux-gnu/gcc (Release)	17m 53s
x86_64-unknown-linux-gnu/clang (Debug)	8m 25s
x86_64-unknown-linux-gnu/clang (Release)	14m 15s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 5m 1s
aarch64-unknown-linux-gnu/gcc (Release)	50m 57s
aarch64-unknown-linux-gnu/clang (Debug)	58m 55s
aarch64-unknown-linux-gnu/clang (Release)	34m 46s
	6h 39m 15s

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