JIT

GH-138245: Perform boolean guards by testing a single bit, rather than a full pointer comparison. #4985

Job	Run time
Interpreter (Debug)	10m 53s
JIT without optimizations (Debug) (21)	13m 33s
JIT with tail calling interpreter (21)	4m 26s
Free-Threaded (Debug) (21)	16m 28s
x86_64-pc-windows-msvc/msvc (Release)	13m 55s
aarch64-pc-windows-msvc/msvc (Release)	17m 36s
i686-pc-windows-msvc/msvc (Release)	14m 26s
x86_64-pc-windows-msvc/msvc (Debug)	25m 41s
i686-pc-windows-msvc/msvc (Debug)	26m 15s
aarch64-pc-windows-msvc/msvc (Debug)	23m 42s
x86_64-apple-darwin/clang (Release)	22m 58s
x86_64-apple-darwin/clang (Debug)	28m 55s
aarch64-apple-darwin/clang (Debug)	15m 4s
aarch64-unknown-linux-gnu/gcc (Release)	7m 19s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 51s
aarch64-apple-darwin/clang (Release)	10m 36s
x86_64-unknown-linux-gnu/gcc (Release)	8m 26s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 17s
	4h 42m 21s

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