JIT

gh-142889: Restructure PyDictKeysObject memory layout for simpler access #5651

Job	Run time
Interpreter (Debug)	11m 59s
x86_64-apple-darwin/clang (Debug)	14m 52s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 56s
x86_64-unknown-linux-gnu/gcc (Release)	8m 49s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 54s
x86_64-pc-windows-msvc/msvc (Debug)	14m 40s
aarch64-pc-windows-msvc/msvc (Release)	14m 43s
aarch64-apple-darwin/clang (Debug)	13m 38s
x86_64-apple-darwin/clang (Release)	14m 53s
i686-pc-windows-msvc/msvc (Release)	14m 48s
aarch64-unknown-linux-gnu/gcc (Release)	6m 46s
Free-Threaded (Debug)	3m 50s
i686-pc-windows-msvc/msvc (Debug)	14m 41s
JIT with tail calling interpreter	3m 53s
aarch64-pc-windows-msvc/msvc (Debug)	14m 43s
JIT without optimizations (Debug)	3m 8s
aarch64-apple-darwin/clang (Release)	13m 22s
x86_64-pc-windows-msvc/msvc (Release)	14m 40s
	3h 26m 15s

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