JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3514

Job	Run time
Interpreter (Debug)	9m 59s
i686-pc-windows-msvc/msvc (Debug)	21m 12s
i686-pc-windows-msvc/msvc (Release)	12m 0s
x86_64-pc-windows-msvc/msvc (Debug)	21m 17s
x86_64-pc-windows-msvc/msvc (Release)	11m 15s
aarch64-pc-windows-msvc/msvc (Debug)	20m 9s
aarch64-pc-windows-msvc/msvc (Release)	18m 10s
x86_64-apple-darwin/clang (Debug)	17m 47s
x86_64-apple-darwin/clang (Release)	11m 1s
aarch64-apple-darwin/clang (Debug)	13m 36s
aarch64-apple-darwin/clang (Release)	9m 36s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 21s
x86_64-unknown-linux-gnu/gcc (Release)	6m 27s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 13s
aarch64-unknown-linux-gnu/gcc (Release)	5m 41s
	3h 16m 44s

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