JIT

gh-144822: remove redundant decref in `codegen.c` (#144823) #6988

Job	Run time
Interpreter (Debug)	11m 38s
JIT without optimizations (Debug) (21)	13m 10s
JIT with tail calling interpreter (21)	4m 27s
Free-Threaded (Debug) (21)	17m 45s
i686-pc-windows-msvc/msvc (Debug)	26m 26s
x86_64-pc-windows-msvc/msvc (Debug)	27m 21s
x86_64-pc-windows-msvc/msvc (Release)	15m 2s
aarch64-pc-windows-msvc/msvc (Debug)	25m 25s
i686-pc-windows-msvc/msvc (Release)	16m 54s
x86_64-unknown-linux-gnu/gcc (Release)	7m 50s
aarch64-apple-darwin/clang (Debug)	12m 3s
x86_64-apple-darwin/clang (Release)	21m 50s
aarch64-apple-darwin/clang (Release)	11m 58s
x86_64-apple-darwin/clang (Debug)	23m 17s
aarch64-pc-windows-msvc/msvc (Release)	17m 37s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 21s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 5s
aarch64-unknown-linux-gnu/gcc (Release)	6m 49s
	4h 40m 58s

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