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These commits modify **compiler targets**. (See the [Target Tier Policy](https://doc.rust-lang.org/nightly/rustc/target-tier-policy.html).) Some changes occurred in compiler/rustc_codegen_gcc cc @antoyo, @GuillaumeGomez

:umbrella: The latest upstream changes (possibly #2681) made this pull request unmergeable. Please [resolve the merge conflicts](https://rustc-dev-guide.rust-lang.org/git.html#rebasing-and-conflicts).

This PR was rebased onto a different master commit. Here's a [range-diff](https://triagebot.infra.rust-lang.org/gh-range-diff/rust-lang/mdBook/59e6afcaad9cb752d794756de1256745da2dd2b5..c209369218311cb3c3912c9f8714f5bffb06506d/fff6087f362be5114f6e6aa24a52dcbbb8f87394..936ac6aab038fbfe4ace10cb0cd3e24920670fee) highlighting what actually changed. *Rebasing is a normal part of keeping PRs up to date, so no action...

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Some changes occurred in compiler/rustc_codegen_gcc cc @antoyo, @GuillaumeGomez These commits modify **compiler targets**. (See the [Target Tier Policy](https://doc.rust-lang.org/nightly/rustc/target-tier-policy.html).)

The Miri subtree was changed cc @rust-lang/miri Some changes occurred in src/tools/clippy cc @rust-lang/clippy