JIT

gh-131798: Narrow the return type of `_FORMAT_SIMPLE` and `_FORMAT_WITH_SPEC` to `str` #5755

Job	Run time
Interpreter (Debug)	12m 1s
Free-Threaded (Debug)	3m 52s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 34s
x86_64-apple-darwin/clang (Release)	28m 49s
x86_64-pc-windows-msvc/msvc (Release)	14m 51s
JIT without optimizations (Debug)	3m 46s
x86_64-pc-windows-msvc/msvc (Debug)	28m 39s
x86_64-apple-darwin/clang (Debug)	32m 1s
aarch64-apple-darwin/clang (Release)	14m 34s
aarch64-apple-darwin/clang (Debug)	14m 1s
aarch64-pc-windows-msvc/msvc (Debug)	27m 26s
aarch64-pc-windows-msvc/msvc (Release)	19m 14s
aarch64-unknown-linux-gnu/gcc (Release)	7m 2s
JIT with tail calling interpreter	4m 40s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 2s
x86_64-unknown-linux-gnu/gcc (Release)	9m 6s
i686-pc-windows-msvc/msvc (Release)	15m 21s
i686-pc-windows-msvc/msvc (Debug)	28m 59s
	4h 45m 58s

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