JIT

gh-131798: Narrow the return type of `_FORMAT_SIMPLE` and `_FORMAT_WITH_SPEC` to `str` #5859

Job	Run time
Interpreter (Debug)	12m 3s
x86_64-apple-darwin/clang (Release)	47m 1s
Free-Threaded (Debug)	3m 48s
JIT with tail calling interpreter	4m 38s
x86_64-apple-darwin/clang (Debug)	39m 2s
JIT without optimizations (Debug)	3m 45s
x86_64-unknown-linux-gnu/gcc (Release)	8m 21s
aarch64-apple-darwin/clang (Debug)	12m 55s
x86_64-unknown-linux-gnu/gcc (Debug)	14m 0s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 48s
i686-pc-windows-msvc/msvc (Release)	15m 37s
aarch64-pc-windows-msvc/msvc (Release)	19m 8s
aarch64-pc-windows-msvc/msvc (Debug)	24m 46s
i686-pc-windows-msvc/msvc (Debug)	28m 20s
aarch64-apple-darwin/clang (Release)	11m 49s
aarch64-unknown-linux-gnu/gcc (Release)	6m 57s
x86_64-pc-windows-msvc/msvc (Debug)	28m 40s
x86_64-pc-windows-msvc/msvc (Release)	15m 11s
	5h 4m 49s

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