JIT

GH-130415: Narrow `str` to `""` based on boolean tests #2846

Job	Run time
Interpreter (Debug)	8m 6s
Free-Threaded (Debug) (19)	13m 30s
i686-pc-windows-msvc/msvc (Debug)	5m 30s
i686-pc-windows-msvc/msvc (Release)	11m 9s
x86_64-pc-windows-msvc/msvc (Debug)	18m 42s
x86_64-pc-windows-msvc/msvc (Release)	11m 13s
aarch64-pc-windows-msvc/msvc (Debug)	5m 0s
aarch64-pc-windows-msvc/msvc (Release)	6m 19s
x86_64-apple-darwin/clang (Debug)	13m 42s
x86_64-apple-darwin/clang (Release)	11m 20s
aarch64-apple-darwin/clang (Debug)	12m 8s
aarch64-apple-darwin/clang (Release)	11m 48s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 3s
x86_64-unknown-linux-gnu/gcc (Release)	5m 52s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 48s
aarch64-unknown-linux-gnu/gcc (Release)	6m 49s
	2h 39m 59s

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