JIT

gh-131798: JIT: Narrow the return type of `_GET_LEN` to int #3433

Job	Run time
Interpreter (Debug)	10m 7s
i686-pc-windows-msvc/msvc (Debug)	24m 46s
i686-pc-windows-msvc/msvc (Release)	14m 46s
x86_64-pc-windows-msvc/msvc (Debug)	22m 37s
x86_64-pc-windows-msvc/msvc (Release)	14m 18s
aarch64-pc-windows-msvc/msvc (Debug)	21m 17s
aarch64-pc-windows-msvc/msvc (Release)	19m 4s
x86_64-apple-darwin/clang (Debug)	15m 30s
x86_64-apple-darwin/clang (Release)	14m 0s
aarch64-apple-darwin/clang (Debug)	10m 26s
aarch64-apple-darwin/clang (Release)	9m 14s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 15s
x86_64-unknown-linux-gnu/gcc (Release)	6m 50s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 51s
aarch64-unknown-linux-gnu/gcc (Release)	6m 32s
	3h 28m 33s

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