JIT

gh-140889: Bump tailcall and JIT CI to llvm 20 (#140963) #4271

Job	Run time
Interpreter (Debug)	9m 52s
Free-Threaded (Debug) (20)	15m 7s
JIT with tail calling interpreter (20)	3m 20s
JIT without optimizations (Debug) (20)	10m 51s
i686-pc-windows-msvc/msvc (Release)	11m 35s
i686-pc-windows-msvc/msvc (Debug)	21m 12s
x86_64-pc-windows-msvc/msvc (Release)	13m 47s
x86_64-pc-windows-msvc/msvc (Debug)	20m 21s
aarch64-pc-windows-msvc/msvc (Release)	16m 49s
aarch64-pc-windows-msvc/msvc (Debug)	23m 49s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 31s
x86_64-unknown-linux-gnu/gcc (Release)	8m 32s
x86_64-apple-darwin/clang (Release)	21m 46s
x86_64-apple-darwin/clang (Debug)	23m 1s
aarch64-apple-darwin/clang (Debug)	11m 49s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 9s
aarch64-apple-darwin/clang (Release)	10m 11s
aarch64-unknown-linux-gnu/gcc (Release)	5m 12s
	4h 5m 54s

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