JIT

GH-130415: Narrow `str` to `""` based on boolean tests #2902

Job	Run time
Interpreter (Debug)	8m 33s
Free-Threaded (Debug) (19)	13m 21s
i686-pc-windows-msvc/msvc (Debug)	18m 50s
i686-pc-windows-msvc/msvc (Release)	11m 46s
x86_64-pc-windows-msvc/msvc (Debug)	18m 22s
x86_64-pc-windows-msvc/msvc (Release)	10m 18s
aarch64-pc-windows-msvc/msvc (Debug)	4m 7s
aarch64-pc-windows-msvc/msvc (Release)	6m 0s
x86_64-apple-darwin/clang (Debug)	12m 7s
x86_64-apple-darwin/clang (Release)	9m 54s
aarch64-apple-darwin/clang (Debug)	12m 50s
aarch64-apple-darwin/clang (Release)	11m 20s
x86_64-unknown-linux-gnu/gcc (Debug)	9m 15s
x86_64-unknown-linux-gnu/gcc (Release)	5m 59s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 28s
aarch64-unknown-linux-gnu/gcc (Release)	7m 23s
	2h 49m 33s

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