Add `_value` API for number literals in proc-macro#154608

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GuillaumeGomez wants to merge 2 commits intorust-lang:mainfrom

GuillaumeGomez:number_value_proc-macro_API

Commits on Mar 31, 2026

Add `_value` API for number literals in proc-macro
GuillaumeGomez
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Ignore `library/proc_macro/src/lib.rs` test on GCC backend due to proc-macro ABI bug
GuillaumeGomez
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