JIT

GH-130415: Narrow `str` to `""` based on boolean tests #2893

Job	Run time
Interpreter (Debug)	8m 32s
Free-Threaded (Debug) (19)	13m 0s
i686-pc-windows-msvc/msvc (Debug)	19m 18s
i686-pc-windows-msvc/msvc (Release)	11m 50s
x86_64-pc-windows-msvc/msvc (Debug)	19m 1s
x86_64-pc-windows-msvc/msvc (Release)	11m 32s
aarch64-pc-windows-msvc/msvc (Debug)	5m 11s
aarch64-pc-windows-msvc/msvc (Release)	6m 51s
x86_64-apple-darwin/clang (Debug)	12m 17s
x86_64-apple-darwin/clang (Release)	8m 30s
aarch64-apple-darwin/clang (Debug)	12m 46s
aarch64-apple-darwin/clang (Release)	12m 5s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 4s
x86_64-unknown-linux-gnu/gcc (Release)	6m 4s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 17s
aarch64-unknown-linux-gnu/gcc (Release)	6m 40s
	2h 52m 58s

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