JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3451

Job	Run time
Interpreter (Debug)	10m 3s
i686-pc-windows-msvc/msvc (Debug)	24m 0s
i686-pc-windows-msvc/msvc (Release)	14m 24s
x86_64-pc-windows-msvc/msvc (Debug)	23m 36s
x86_64-pc-windows-msvc/msvc (Release)	14m 43s
aarch64-pc-windows-msvc/msvc (Debug)	22m 30s
aarch64-pc-windows-msvc/msvc (Release)	19m 49s
x86_64-apple-darwin/clang (Debug)	16m 52s
x86_64-apple-darwin/clang (Release)	10m 13s
aarch64-apple-darwin/clang (Debug)	10m 15s
aarch64-apple-darwin/clang (Release)	9m 23s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 15s
x86_64-unknown-linux-gnu/gcc (Release)	6m 28s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 4s
aarch64-unknown-linux-gnu/gcc (Release)	6m 28s
	3h 28m 3s

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