JIT

gh-142889: Restructure PyDictKeysObject memory layout for simpler access #5483

Job	Run time
Interpreter (Debug)	12m 2s
Free-Threaded (Debug)	3m 16s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 56s
x86_64-apple-darwin/clang (Debug)	44m 36s
aarch64-apple-darwin/clang (Release)	10m 55s
JIT with tail calling interpreter	4m 39s
JIT without optimizations (Debug)	3m 38s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 45s
aarch64-apple-darwin/clang (Debug)	14m 7s
aarch64-unknown-linux-gnu/gcc (Release)	6m 54s
i686-pc-windows-msvc/msvc (Debug)	28m 18s
x86_64-unknown-linux-gnu/gcc (Release)	8m 38s
aarch64-pc-windows-msvc/msvc (Release)	17m 56s
i686-pc-windows-msvc/msvc (Release)	16m 0s
x86_64-apple-darwin/clang (Release)	46m 11s
x86_64-pc-windows-msvc/msvc (Release)	14m 50s
aarch64-pc-windows-msvc/msvc (Debug)	22m 57s
x86_64-pc-windows-msvc/msvc (Debug)	24m 17s
	5h 1m 55s

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