JIT

gh-149965: Improve thread-safety in ElementObjects within `element_ass_subscr` #6728

Job	Run time
Free-Threaded (Debug)	4m 11s
aarch64-apple-darwin/clang (Release)	8m 25s
x86_64-apple-darwin/clang (Release)	8m 17s
aarch64-apple-darwin/clang (Debug)	8m 37s
JIT with tail calling interpreter	4m 49s
x86_64-unknown-linux-gnu/gcc (Release)	7m 44s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 9s
x86_64-apple-darwin/clang (Debug)	8m 27s
aarch64-pc-windows-msvc/msvc (Release)	8m 6s
aarch64-pc-windows-msvc/msvc (Debug)	8m 3s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 12s
x86_64-pc-windows-msvc/msvc (Debug)	8m 6s
Interpreter (Debug)	8m 10s
x86_64-pc-windows-msvc/msvc (Release)	8m 5s
i686-pc-windows-msvc/msvc (Debug)	8m 2s
i686-pc-windows-msvc/msvc (Release)	8m 5s
JIT without optimizations (Debug)	4m 3s
aarch64-unknown-linux-gnu/gcc (Release)	7m 41s
	2h 15m 12s

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