[Bug 223300] www/firefox (firefox-56.0.2_3,1) with rust-1.21.0 on i386: error[E0432]: unresolved import `x86::sse2`

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

            Bug ID: 223300
           Summary: www/firefox (firefox-56.0.2_3,1) with rust-1.21.0 on
                    i386: error[E0432]: unresolved import `x86::sse2`
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: gecko at FreeBSD.org
             Flags: maintainer-feedback?(gecko at FreeBSD.org)

Created attachment 187555
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187555&action=edit
Poudriere log for www/firefox

After updating my ports tree to r453055, lang/rust got updated to 1.21.0, and
www/firefox to 56.0.2_3,1.  Building under poudriere now results in an error
(it used to build OK in the past):

...
gmake[6]: Entering directory
'/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/obj-x86_64-unknown-freebsd11.1/toolkit/library/rust'
force-cargo-library-build
env   RUSTC_BOOTSTRAP=1 RUSTFLAGS=' ' 
CARGO_TARGET_DIR=/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/obj-x86_64-unknown-freebsd11.1/toolkit/library
RUSTC=/usr/local/bin/rustc
MOZ_SRC=/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2
MOZ_DIST=/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/obj-x86_64-unknown-freebsd11.1/dist
LIBCLANG_PATH="/usr/local/llvm40/lib" CLANG_PATH="/usr/local/llvm40/bin/clang"
PKG_CONFIG_ALLOW_CROSS=1 RUST_BACKTRACE=1
MOZ_TOPOBJDIR=/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/obj-x86_64-unknown-freebsd11.1
MOZ_CARGO_WRAP_LDFLAGS="-pthread -Wl,--as-needed -fstack-protector
-Wl,-z,noexecstack -Wl,-z,text -Wl,-z,relro
-Wl,-rpath-link,/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/obj-x86_64-unknown-freebsd11.1/dist/bin
-Wl,-rpath-link,/usr/local/lib" MOZ_CARGO_WRAP_LD=" /usr/bin/cc -std=gnu99"
CARGO_TARGET_X86_64_UNKNOWN_FREEBSD_LINKER=/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/build/cargo-linker
/usr/local/bin/cargo build  --release --frozen --manifest-path
/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/toolkit/library/rust/Cargo.toml
--lib --target=x86_64-unknown-freebsd --features "servo bindgen simd-accel
no-static-ideograph-encoder-tables"
   Compiling nom v1.2.4
   Compiling rayon-core v1.2.0
   Compiling nsstring_vendor v0.1.0
(file:///wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/servo/components/style/gecko_bindings/nsstring_vendor)
   Compiling either v1.1.0
   Compiling smallvec v0.4.0
   Compiling stable_deref_trait v1.0.0
   Compiling same-file v0.1.3
   Compiling precomputed-hash v0.1.0
   Compiling scopeguard v0.3.2
   Compiling void v1.0.2
   Compiling regex-syntax v0.4.0
   Compiling fnv v1.0.5
   Compiling odds v0.2.25
   Compiling libc v0.2.24
   Compiling rustc-serialize v0.3.22
   Compiling simd v0.2.0
error[E0432]: unresolved import `x86::sse2`
  -->
/wrkdirs/usr/ports/www/firefox/work/firefox-56.0.2/third_party/rust/simd/src/common.rs:17:10
   |
17 | use x86::sse2::common;
   |          ^^^^ Could not find `sse2` in `x86`

   Compiling unicode-xid v0.0.4
   Compiling unicode-normalization v0.1.4
error: aborting due to previous error

error: Could not compile `simd`.

I guess either the sse2 component got removed from rust, or the firefox
component got updated to now include it?

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