[Bug 223300] www/firefox (56+) fails to build using lang/rust (1.21+) built with PORT_LLVM=on: error[E0432]: unresolved import `x86::sse2`

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223300

--- Comment #25 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dumbbell
Date: Mon Nov 27 18:16:15 UTC 2017
New revision: 454983
URL: https://svnweb.freebsd.org/changeset/ports/454983

Log:
  lang/rust: Remove the LLVM_PORT option

  FTR, this option allowed to used LLVM from ports instead of building the
  bundled copy.

  The problem is that this combination isn't really tested upstream. This
  led to regressions which are difficult to diagnose. For instance, in
  Rust 1.21.0, the bundled LLVM provided a new API to query the features
  supported by the target arch. The equivalent code inside Rust was
  removed to use that new API. Unfortunately, building Rust 1.21.0+ with a
  copy of LLVM not providing this API didn't failed but instead made that
  list of CPU features empty. This resulted in the following obscure build
  failure in Firefox:

      error[E0432]: unresolved import `x86::sse2`

  To avoid future pain for both end users and maintainers, we decided to
  remove that option. Yes, it will increase the (already long) time to
  build Rust, but it should save time wasted on debugging what is not
  really supported anyway.

  PR:           223342, 223300
  Reported by:  Many users

Changes:
  head/lang/rust/Makefile
  head/lang/rust/files/config.toml

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