JIT

gh-130415: Narrowing to constants in branches involving `is` comparis… #5074

Job	Run time
Interpreter (Debug)	10m 57s
Free-Threaded (Debug) (21)	15m 36s
JIT with tail calling interpreter (21)	3m 49s
JIT without optimizations (Debug) (21)	12m 59s
x86_64-pc-windows-msvc/msvc (Debug)	25m 13s
x86_64-pc-windows-msvc/msvc (Release)	14m 30s
aarch64-apple-darwin/clang (Release)	10m 43s
aarch64-pc-windows-msvc/msvc (Release)	18m 16s
aarch64-apple-darwin/clang (Debug)	14m 29s
i686-pc-windows-msvc/msvc (Release)	14m 24s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 45s
i686-pc-windows-msvc/msvc (Debug)	25m 37s
x86_64-apple-darwin/clang (Debug)	28m 38s
aarch64-unknown-linux-gnu/gcc (Release)	6m 54s
aarch64-pc-windows-msvc/msvc (Debug)	23m 46s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 48s
x86_64-unknown-linux-gnu/gcc (Release)	7m 52s
x86_64-apple-darwin/clang (Release)	19m 20s
	4h 34m 36s

Provide feedback