Auto merge of #154870 - JonathanBrouwer:rollup-OFrhW8F, r=JonathanBrouwer

Rollup of 9 pull requests

Successful merges:

 - rust-lang/rust#153440 (Various LTO cleanups)
 - rust-lang/rust#151899 (Constify fold, reduce and last for iterator)
 - rust-lang/rust#154561 (Suggest similar keyword when visibility is not followed by an item)
 - rust-lang/rust#154657 (Fix pattern assignment suggestions for uninitialized bindings)
 - rust-lang/rust#154717 (Fix ICE in unsafe binder discriminant helpers)
 - rust-lang/rust#154722 (fix(lints): Improve `ill_formed_attribute_input` with better help message)
 - rust-lang/rust#154777 (`#[cfg]`: suggest alternative `target_` name when the value does not match)
 - rust-lang/rust#154849 (Promote `char::is_case_ignorable` from perma-unstable to unstable)
 - rust-lang/rust#154850 (ast_validation: scalable vectors okay for rustdoc)

Author: bors