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Auto merge of #151543 - GuillaumeGomez:more-proc-macro-literal-methods, r=Amanieu
Add new `byte_value` and `char_value` methods to `proc_macro::Literal`
Part of https://github.com/rust-lang/rust/issues/136652.
It adds two more methods to get unescaped `u8` and `char` from `proc_macro::Literal`.
r? @Amanieu
