JIT

gh-140889: Bump tailcall and JIT CI to llvm 20 (#140963) #6802

Job	Run time
Interpreter (Debug)	10m 24s
Free-Threaded (Debug) (20)	17m 13s
JIT without optimizations (Debug) (20)	11m 20s
JIT with tail calling interpreter (20)	3m 25s
x86_64-pc-windows-msvc/msvc (Debug)	19m 40s
i686-pc-windows-msvc/msvc (Release)	12m 4s
x86_64-pc-windows-msvc/msvc (Release)	11m 25s
aarch64-pc-windows-msvc/msvc (Debug)	20m 49s
x86_64-apple-darwin/clang (Debug)	26m 10s
i686-pc-windows-msvc/msvc (Debug)	21m 43s
x86_64-apple-darwin/clang (Release)	26m 38s
aarch64-unknown-linux-gnu/gcc (Debug)	6m 55s
aarch64-apple-darwin/clang (Debug)	14m 10s
aarch64-unknown-linux-gnu/gcc (Release)	5m 31s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 32s
aarch64-apple-darwin/clang (Release)	11m 49s
aarch64-pc-windows-msvc/msvc (Release)	16m 54s
x86_64-unknown-linux-gnu/gcc (Release)	8m 11s
	4h 16m 53s

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