[Bug 213402] www/firefox fatal error: error in backend: Cannot select: 0x30ba3640: i32 = truncate 0x30c2db40

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213402

            Bug ID: 213402
           Summary: www/firefox fatal error: error in backend: Cannot
                    select: 0x30ba3640: i32 = truncate       0x30c2db40
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko at FreeBSD.org
          Reporter: fbsd at www.zefox.net
             Flags: maintainer-feedback?(gecko at FreeBSD.org)
          Assignee: gecko at FreeBSD.org

On:

FreeBSD www.zefox.com 11.0-PRERELEASE FreeBSD 11.0-PRERELEASE #7 r307003: Mon
Oct 10 13:03:26 PDT 2016     bob at www.zefox.com:/usr/obj/usr/src/sys/RPI2  arm

firefox build fails with

fatal error: error in backend: Cannot select: 0x30ba3640: i32 = truncate
      0x30c2db40
  0x30c2db40: f64,ch = CopyFromReg 0x22cb5158, Register:f64 %vreg21
    0x30ba1a00: f64 = Register %vreg21
In function:
_ZN7mozilla3dom24CanvasRenderingContext2D12GetImageDataEP9JSContextddddRNS_11ErrorResultE
c++: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM
3.8.0)
Target: armv6--freebsd11.0-gnueabihf
Thread model: posix
InstalledDir: /usr/bin
c++: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed
source, and associated run script.
c++: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
c++: note: diagnostic msg: /tmp/Unified_cpp_dom_canvas0-ab853d.cpp
c++: note: diagnostic msg: /tmp/Unified_cpp_dom_canvas0-ab853d.sh

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