JIT

Avoid branch for known mortal objects #527

Job	Run time
Interpreter (Debug)	8m 41s
Free-Threaded (Debug) (19)	13m 24s
i686-pc-windows-msvc/msvc (Debug)	1h 30m 8s
i686-pc-windows-msvc/msvc (Release)	11m 37s
x86_64-pc-windows-msvc/msvc (Debug)	1h 30m 9s
x86_64-pc-windows-msvc/msvc (Release)	12m 9s
aarch64-pc-windows-msvc/msvc (Debug)	5m 19s
aarch64-pc-windows-msvc/msvc (Release)	6m 36s
x86_64-apple-darwin/clang (Debug)	21m 43s
x86_64-apple-darwin/clang (Release)	7m 21s
aarch64-apple-darwin/clang (Debug)	12m 48s
aarch64-apple-darwin/clang (Release)	12m 53s
x86_64-unknown-linux-gnu/gcc (Debug)	9m 33s
x86_64-unknown-linux-gnu/gcc (Release)	6m 47s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 24s
aarch64-unknown-linux-gnu/gcc (Release)	7m 29s
	5h 26m 1s

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