JIT

gh-131798: Narrow the return type of `_FORMAT_SIMPLE` and `_FORMAT_WITH_SPEC` to `str` #5785

Job	Run time
aarch64-unknown-linux-gnu/gcc (Debug)	8m 57s
x86_64-unknown-linux-gnu/gcc (Release)	8m 44s
aarch64-apple-darwin/clang (Release)	11m 27s
Free-Threaded (Debug)	3m 43s
JIT without optimizations (Debug)	3m 7s
x86_64-pc-windows-msvc/msvc (Release)	14m 46s
JIT with tail calling interpreter	4m 33s
Interpreter (Debug)	12m 2s
x86_64-apple-darwin/clang (Debug)	1h 5m 0s
i686-pc-windows-msvc/msvc (Debug)	29m 30s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 33s
x86_64-pc-windows-msvc/msvc (Debug)	28m 31s
x86_64-apple-darwin/clang (Release)	34m 42s
aarch64-unknown-linux-gnu/gcc (Release)	7m 16s
aarch64-apple-darwin/clang (Debug)	12m 46s
i686-pc-windows-msvc/msvc (Release)	15m 13s
aarch64-pc-windows-msvc/msvc (Debug)	27m 12s
aarch64-pc-windows-msvc/msvc (Release)	21m 6s
	5h 21m 8s

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