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Add benchmarks for `impl Debug for str` In order to inform future perf improvements and prevent regressions, lets add some benchmarks that stress `impl Debug for str`. --- As I am currently working on improving the perf in https://github.com/rust-lang/rust/pull/121150, its nice to have these benchmarks. Writing them, I also saw that escapes are written out one char at a time, even though other parts of the code are already optimizing that via `as_str`, which I intend to do as well as a followup improvement. r? ``@cuviper`` ☝🏻 as you were also assigned to https://github.com/rust-lang/rust/pull/121150, CC ``@the8472`` if you want to steal the review :-)