JIT

gh-131798: Narrow the return type of `_FORMAT_SIMPLE` and `_FORMAT_WITH_SPEC` to `str` #6401

Job	Run time
Interpreter (Debug)	12m 56s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 15s
aarch64-unknown-linux-gnu/gcc (Release)	6m 36s
aarch64-apple-darwin/clang (Release)	14m 29s
JIT without optimizations (Debug)	3m 13s
x86_64-unknown-linux-gnu/gcc (Debug)	15m 23s
x86_64-apple-darwin/clang (Debug)	34m 26s
x86_64-unknown-linux-gnu/gcc (Release)	8m 5s
x86_64-apple-darwin/clang (Release)	29m 26s
JIT with tail calling interpreter	5m 5s
aarch64-apple-darwin/clang (Debug)	15m 34s
Free-Threaded (Debug)	3m 37s
i686-pc-windows-msvc/msvc (Debug)	25m 26s
x86_64-pc-windows-msvc/msvc (Debug)	23m 37s
x86_64-pc-windows-msvc/msvc (Release)	15m 39s
i686-pc-windows-msvc/msvc (Release)	17m 3s
aarch64-pc-windows-msvc/msvc (Debug)	26m 15s
aarch64-pc-windows-msvc/msvc (Release)	18m 48s
	4h 44m 53s

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