Rollup merge of #88954 - nbdd0121:panic3, r=oli-obk
Allow `panic!("{}", computed_str)` in const fn. Special-case `panic!("{}", arg)` and translate it to `panic_display(&arg)`. `panic_display` will behave like `panic_any` in cosnt eval and behave like `panic!(format_args!("{}", arg))` in runtime. This should bring Rust 2015 and 2021 to feature parity in terms of `const_panic`; and hopefully would unblock the stabilisation of #51999. `@rustbot` modify labels: +T-compiler +T-libs +A-const-eval +A-const-fn r? `@oli-obk`
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