Rust on FreeBSD

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Only 10.1 amd64 supports segmented stacks, which were previously? required for rust.
- Apparently segmented stacks can now be disabled via morestack: false (Example)
It's still desirable to add segmented stack support, but it requires kernel changes
- Go back as far as we can in stable/X

Get the new Rust FreeBSD buildbots live
Build using system (ports) llvm (devel/llvmXY) not the bundled one - DONE
Test build on 9.x amd64 using upstream stage0 amd64 compiler + devel/libc++ - IN PROGRESS
Build rust on amd64 through all supported versions (9.x → CURRENT)
Build & test cross-compile inf/bits
Build a stage0 compiler for i386 - DONE (upstream now provides i386 snapshots as well)
Land a port for Cargo - DONE
Build rust on Tier 2's (arm*)
- See bootstrap and cross-compilation notes from JeanSébastienPédron: https://gist.github.com/dumbbell/b587da50ef014078da9e732a4331ebad
- armv6: Work in progress by Mikaël Urankar: Rust and Cargo are bootstrapped but Cargo segfaults with non-trivial crates;
- aarch64: Work in progress:
  - ~~https://github.com/rust-lang/libc/pull/512~~
  - ~~https://github.com/rust-lang/rust/pull/39491~~
  - ~~https://github.com/rust-lang/rust/pull/39601~~
  - Bootstrap: https://people.freebsd.org/~dumbbell/rust/aarch64/
  - Waiting on https://reviews.freebsd.org/D9286 to first update lang/rust-nightly
- sparc64: Work in progress by JeanSébastienPédron: Trying Rust self-hosting now
  - Bootstrap: https://people.freebsd.org/~dumbbell/rust/sparc64/
Test actual Rust software, fix bugs, submit pull requests upstream …

Ports