JIT

GH-130415: Narrow `str` to `""` based on boolean tests #2839

Job	Run time
Interpreter (Debug)	8m 1s
Free-Threaded (Debug) (19)	6m 15s
i686-pc-windows-msvc/msvc (Debug)	5m 58s
i686-pc-windows-msvc/msvc (Release)	5m 58s
x86_64-pc-windows-msvc/msvc (Debug)	6m 3s
x86_64-pc-windows-msvc/msvc (Release)	5m 56s
aarch64-pc-windows-msvc/msvc (Debug)	4m 49s
aarch64-pc-windows-msvc/msvc (Release)	5m 50s
x86_64-apple-darwin/clang (Debug)	6m 13s
x86_64-apple-darwin/clang (Release)	6m 12s
aarch64-apple-darwin/clang (Debug)	6m 16s
aarch64-apple-darwin/clang (Release)	6m 17s
x86_64-unknown-linux-gnu/gcc (Debug)	6m 11s
x86_64-unknown-linux-gnu/gcc (Release)	5m 45s
aarch64-unknown-linux-gnu/gcc (Debug)	6m 12s
aarch64-unknown-linux-gnu/gcc (Release)	6m 11s
	1h 38m 7s

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