JIT

gh-131798: Narrow the return type of `_FORMAT_SIMPLE` and `_FORMAT_WITH_SPEC` to `str` #5810

Job	Run time
Interpreter (Debug)	12m 20s
x86_64-apple-darwin/clang (Release)	33m 34s
Free-Threaded (Debug)	3m 52s
JIT with tail calling interpreter	4m 37s
JIT without optimizations (Debug)	3m 44s
aarch64-apple-darwin/clang (Release)	11m 29s
aarch64-apple-darwin/clang (Debug)	13m 35s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 43s
x86_64-unknown-linux-gnu/gcc (Release)	8m 46s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 2s
aarch64-unknown-linux-gnu/gcc (Release)	7m 10s
i686-pc-windows-msvc/msvc (Debug)	29m 19s
i686-pc-windows-msvc/msvc (Release)	15m 20s
x86_64-pc-windows-msvc/msvc (Debug)	29m 1s
aarch64-pc-windows-msvc/msvc (Release)	17m 18s
aarch64-pc-windows-msvc/msvc (Debug)	24m 43s
x86_64-apple-darwin/clang (Debug)	1h 5m 0s
x86_64-pc-windows-msvc/msvc (Release)	14m 10s
	5h 16m 43s

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