JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3501

Job	Run time
Interpreter (Debug)	11m 47s
i686-pc-windows-msvc/msvc (Debug)	20m 39s
i686-pc-windows-msvc/msvc (Release)	12m 13s
x86_64-pc-windows-msvc/msvc (Debug)	21m 5s
x86_64-pc-windows-msvc/msvc (Release)	12m 59s
aarch64-pc-windows-msvc/msvc (Debug)	21m 5s
aarch64-pc-windows-msvc/msvc (Release)	16m 46s
x86_64-apple-darwin/clang (Debug)	14m 31s
x86_64-apple-darwin/clang (Release)	12m 39s
aarch64-apple-darwin/clang (Debug)	11m 42s
aarch64-apple-darwin/clang (Release)	10m 47s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 46s
x86_64-unknown-linux-gnu/gcc (Release)	6m 26s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 0s
aarch64-unknown-linux-gnu/gcc (Release)	6m 46s
	3h 18m 11s

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