JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3393

Job	Run time
Interpreter (Debug)	9m 36s
i686-pc-windows-msvc/msvc (Debug)	22m 47s
i686-pc-windows-msvc/msvc (Release)	14m 25s
x86_64-pc-windows-msvc/msvc (Debug)	21m 56s
x86_64-pc-windows-msvc/msvc (Release)	13m 14s
aarch64-pc-windows-msvc/msvc (Debug)	21m 25s
aarch64-pc-windows-msvc/msvc (Release)	18m 43s
x86_64-apple-darwin/clang (Debug)	12m 55s
x86_64-apple-darwin/clang (Release)	12m 33s
aarch64-apple-darwin/clang (Debug)	10m 58s
aarch64-apple-darwin/clang (Release)	8m 57s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 19s
x86_64-unknown-linux-gnu/gcc (Release)	7m 40s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 40s
aarch64-unknown-linux-gnu/gcc (Release)	6m 21s
	3h 19m 29s

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