JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3453

Job	Run time
Interpreter (Debug)	9m 54s
i686-pc-windows-msvc/msvc (Debug)	20m 41s
i686-pc-windows-msvc/msvc (Release)	11m 12s
x86_64-pc-windows-msvc/msvc (Debug)	23m 9s
x86_64-pc-windows-msvc/msvc (Release)	12m 50s
aarch64-pc-windows-msvc/msvc (Debug)	23m 39s
aarch64-pc-windows-msvc/msvc (Release)	18m 58s
x86_64-apple-darwin/clang (Debug)	18m 15s
x86_64-apple-darwin/clang (Release)	11m 18s
aarch64-apple-darwin/clang (Debug)	9m 59s
aarch64-apple-darwin/clang (Release)	9m 7s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 45s
x86_64-unknown-linux-gnu/gcc (Release)	6m 32s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 17s
aarch64-unknown-linux-gnu/gcc (Release)	6m 23s
	3h 20m 59s

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