Rollup of 13 pull requests

[jonas-schievink]

Successful merges:

• Allow making RUSTC_BOOTSTRAP conditional on the crate name #77802 (Allow making RUSTC_BOOTSTRAP conditional on the crate name)
• Add --color support to bootstrap #79004 (Add --color support to bootstrap)
• cleanup: Remove ParseSess::injected_crate_name #79005 (cleanup: Remove ParseSess::injected_crate_name)
• Make _ an expression, to discard values in destructuring assignments #79016 (Make _ an expression, to discard values in destructuring assignments)
• astconv: extract closures into a separate trait #79019 (astconv: extract closures into a separate trait)
• Implement BTreeMap::retain and BTreeSet::retain #79026 (Implement BTreeMap::retain and BTreeSet::retain)
• Validate that locals have a corresponding LocalDecl #79031 (Validate that locals have a corresponding LocalDecl)
• rustc_resolve: Make macro_rules scope chain compression lazy #79034 (rustc_resolve: Make macro_rules scope chain compression lazy)
• Move Steal to rustc_data_structures. #79036 (Move Steal to rustc_data_structures.)
• Rename clean::{ItemEnum -> ItemKind}, clean::Item::{inner -> kind} #79041 (Rename clean::{ItemEnum -> ItemKind}, clean::Item::{inner -> kind})
• Move likely/unlikely argument outside of invisible unsafe block #79058 (Move likely/unlikely argument outside of invisible unsafe block)
• Print 'checking cranelift artifacts' to easily separate it from other artifacts #79059 (Print 'checking cranelift artifacts' to easily separate it from other artifacts)
• Update rustfmt to v1.4.26 #79063 (Update rustfmt to v1.4.26)

Failed merges:

r? @ghost
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