JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3392

Job	Run time
Interpreter (Debug)	9m 33s
i686-pc-windows-msvc/msvc (Debug)	23m 15s
i686-pc-windows-msvc/msvc (Release)	13m 51s
x86_64-pc-windows-msvc/msvc (Debug)	22m 30s
x86_64-pc-windows-msvc/msvc (Release)	12m 47s
aarch64-pc-windows-msvc/msvc (Debug)	22m 20s
aarch64-pc-windows-msvc/msvc (Release)	18m 45s
x86_64-apple-darwin/clang (Debug)	12m 29s
x86_64-apple-darwin/clang (Release)	10m 20s
aarch64-apple-darwin/clang (Debug)	9m 43s
aarch64-apple-darwin/clang (Release)	9m 37s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 13s
x86_64-unknown-linux-gnu/gcc (Release)	6m 13s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 25s
aarch64-unknown-linux-gnu/gcc (Release)	5m 48s
	3h 15m 49s

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