JIT

GH-148726: Forward-port generational GC. #6314

Job	Run time
Interpreter (Debug)	11m 46s
JIT without optimizations (Debug)	3m 14s
aarch64-unknown-linux-gnu/gcc (Release)	6m 19s
aarch64-apple-darwin/clang (Release)	13m 10s
aarch64-pc-windows-msvc/msvc (Debug)	25m 8s
i686-pc-windows-msvc/msvc (Release)	16m 29s
aarch64-pc-windows-msvc/msvc (Release)	18m 46s
i686-pc-windows-msvc/msvc (Debug)	24m 51s
JIT with tail calling interpreter	4m 5s
x86_64-unknown-linux-gnu/gcc (Release)	8m 42s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 4s
Free-Threaded (Debug)	3m 38s
x86_64-apple-darwin/clang (Debug)	33m 44s
x86_64-apple-darwin/clang (Release)	50m 3s
x86_64-pc-windows-msvc/msvc (Debug)	25m 55s
x86_64-pc-windows-msvc/msvc (Release)	15m 39s
aarch64-apple-darwin/clang (Debug)	15m 18s
x86_64-unknown-linux-gnu/gcc (Debug)	14m 57s
	5h 0m 48s

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