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The latest versions of `memchr` experience LTO-related issues when compiling for windows-gnu [1], so needs to be pinned. The issue is present in the standard library. `memchr` has been pinned in `rustc_ast`, but since the workspace was recently split, this pin no longer has any effect on library crates. Resolve this by adding `memchr` as an _unused_ dependency in `std`, pinned to 2.5. Additionally, remove the pin in `rustc_ast` to allow non-library crates to upgrade to the latest version. Link: https://github.com/rust-lang/rust/issues/127890 [1]