- Always use --local-rust-root, even for bootstrap binaries.
- Remove the rebuild conditional - the build system now figures it out.
- Let minidebuginfo do its thing, since metadata is no longer a note.
- Let rust build its own compiler-rt builtins again.
- Drop the backported patches.
- Patch get-stage0.py to trust existing bootstrap binaries.
- Use libclang_rt.builtins from compiler-rt, dodging llvm-static issues.
- Use --local-rust-root to make sure the right bootstrap is used.
