JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3456

Job	Run time
Interpreter (Debug)	10m 0s
i686-pc-windows-msvc/msvc (Debug)	23m 17s
i686-pc-windows-msvc/msvc (Release)	15m 25s
x86_64-pc-windows-msvc/msvc (Debug)	22m 51s
x86_64-pc-windows-msvc/msvc (Release)	14m 46s
aarch64-pc-windows-msvc/msvc (Debug)	23m 8s
aarch64-pc-windows-msvc/msvc (Release)	18m 10s
x86_64-apple-darwin/clang (Debug)	16m 39s
x86_64-apple-darwin/clang (Release)	11m 45s
aarch64-apple-darwin/clang (Debug)	10m 4s
aarch64-apple-darwin/clang (Release)	9m 20s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 12s
x86_64-unknown-linux-gnu/gcc (Release)	6m 27s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 56s
aarch64-unknown-linux-gnu/gcc (Release)	6m 18s
	3h 28m 18s

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