JIT

gh-142889: Restructure PyDictKeysObject memory layout for simpler access #5338

Job	Run time
Interpreter (Debug)	11m 31s
JIT without optimizations (Debug) (21)	5m 14s
Free-Threaded (Debug) (21)	5m 15s
JIT with tail calling interpreter (21)	3m 55s
aarch64-pc-windows-msvc/msvc (Debug)	5m 6s
i686-pc-windows-msvc/msvc (Debug)	5m 4s
x86_64-pc-windows-msvc/msvc (Release)	5m 4s
x86_64-apple-darwin/clang (Debug)	5m 19s
aarch64-pc-windows-msvc/msvc (Release)	5m 7s
i686-pc-windows-msvc/msvc (Release)	5m 4s
aarch64-unknown-linux-gnu/gcc (Release)	5m 11s
x86_64-pc-windows-msvc/msvc (Debug)	5m 3s
aarch64-apple-darwin/clang (Debug)	5m 15s
x86_64-unknown-linux-gnu/gcc (Debug)	5m 14s
x86_64-apple-darwin/clang (Release)	5m 19s
x86_64-unknown-linux-gnu/gcc (Release)	5m 14s
aarch64-unknown-linux-gnu/gcc (Debug)	5m 11s
aarch64-apple-darwin/clang (Release)	5m 20s
	1h 38m 26s

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