JIT

gh-142889: Restructure PyDictKeysObject memory layout for simpler access #5351

Job	Run time
Interpreter (Debug)	11m 47s
JIT without optimizations (Debug) (21)	13m 38s
Free-Threaded (Debug) (21)	17m 45s
JIT with tail calling interpreter (21)	4m 36s
aarch64-pc-windows-msvc/msvc (Release)	18m 57s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 13s
i686-pc-windows-msvc/msvc (Release)	14m 44s
x86_64-apple-darwin/clang (Debug)	40m 12s
aarch64-pc-windows-msvc/msvc (Debug)	24m 57s
aarch64-unknown-linux-gnu/gcc (Release)	6m 51s
x86_64-pc-windows-msvc/msvc (Release)	14m 48s
x86_64-apple-darwin/clang (Release)	19m 51s
i686-pc-windows-msvc/msvc (Debug)	27m 17s
x86_64-pc-windows-msvc/msvc (Debug)	28m 7s
x86_64-unknown-linux-gnu/gcc (Release)	8m 31s
aarch64-apple-darwin/clang (Release)	12m 49s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 13s
aarch64-apple-darwin/clang (Debug)	15m 3s
	5h 1m 19s

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