Rollup of 13 pull requests
Successful merges:
- #51548 (Initialize LLVM's AMDGPU target machine, if available.)
- #51809 (Add read_exact_at and write_all_at methods to FileExt on unix)
- #51914 (add outlives annotations to `BTreeMap`)
- #51958 (Show known meta items in unknown meta items error)
- #51973 (Make Stdio handle UnwindSafe)
- #51977 (bootstrap: tests should use rustc from config.toml)
- #51978 (Do not suggest changes to str literal if it isn't one)
- #51979 (Get rid of `TyImplTraitExistential`)
- #51980 (Emit column info in debuginfo for non msvc like targets)
- #51982 (incr.comp.: Take names of children into account when computing the ICH of a module's HIR.)
- #51997 (add entry for cargo-metadata feature to RELEASES)
- #52004 (toolstate: Fixed detection of changed submodule, and other fixes.)
- #52006 ( Change --keep-stage to apply more often)
Failed merges:
r? @ghost
860d169474