JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3445

Job	Run time
Interpreter (Debug)	10m 3s
i686-pc-windows-msvc/msvc (Debug)	22m 12s
i686-pc-windows-msvc/msvc (Release)	12m 7s
x86_64-pc-windows-msvc/msvc (Debug)	21m 23s
x86_64-pc-windows-msvc/msvc (Release)	12m 0s
aarch64-pc-windows-msvc/msvc (Debug)	20m 59s
aarch64-pc-windows-msvc/msvc (Release)	20m 45s
x86_64-apple-darwin/clang (Debug)	13m 44s
x86_64-apple-darwin/clang (Release)	10m 54s
aarch64-apple-darwin/clang (Debug)	10m 12s
aarch64-apple-darwin/clang (Release)	9m 20s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 58s
x86_64-unknown-linux-gnu/gcc (Release)	6m 40s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 30s
aarch64-unknown-linux-gnu/gcc (Release)	6m 41s
	3h 15m 28s

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