Rollup of 10 pull requests

[Kobzol]

Successful merges:

• Port #[link_ordinal] to the new attribute parsing infrastructure #143217 (Port #[link_ordinal] to the new attribute parsing infrastructure)
• bootstrap/miri: avoid rebuilds for test builds #143681 (bootstrap/miri: avoid rebuilds for test builds)
• Tidy cleanup #143724 (Tidy cleanup)
• Change bootstrap's tool.TOOL_NAME.features to work on any subcommand #143733 (Change bootstrap's tool.TOOL_NAME.features to work on any subcommand)
• Compiletest: Simplify {Html,Json}DocCk directive handling #143850 (Compiletest: Simplify {Html,Json}DocCk directive handling)
• update issue number for const_trait_impl #143875 (update issue number for const_trait_impl)
• Use zero for initialized Once state #143881 (Use zero for initialized Once state)
• Run bootstrap tests sooner in the x test pipeline #143887 (Run bootstrap tests sooner in the x test pipeline)
• Change "allocated object" to "allocation". #143917 (Change "allocated object" to "allocation".)
• Tier check cleanup #143918 (Tier check cleanup)

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