JIT

gh-142889: Restructure PyDictKeysObject memory layout for simpler access #5704

Job	Run time
x86_64-apple-darwin/clang (Debug)	26m 58s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 43s
aarch64-unknown-linux-gnu/gcc (Release)	7m 4s
x86_64-apple-darwin/clang (Release)	32m 53s
JIT without optimizations (Debug)	3m 40s
Interpreter (Debug)	12m 0s
aarch64-pc-windows-msvc/msvc (Debug)	24m 59s
x86_64-pc-windows-msvc/msvc (Debug)	28m 21s
JIT with tail calling interpreter	4m 51s
i686-pc-windows-msvc/msvc (Release)	15m 37s
x86_64-unknown-linux-gnu/gcc (Release)	8m 56s
aarch64-apple-darwin/clang (Debug)	12m 41s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 2s
Free-Threaded (Debug)	3m 33s
x86_64-pc-windows-msvc/msvc (Release)	15m 56s
i686-pc-windows-msvc/msvc (Debug)	29m 43s
aarch64-apple-darwin/clang (Release)	11m 44s
aarch64-pc-windows-msvc/msvc (Release)	18m 28s
	4h 40m 9s

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