[Bug 225488] clang-6.0.0 crashes building multimedia/libvpx

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225488

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Sun Jan 28 16:10:41 UTC 2018
New revision: 328513
URL: https://svnweb.freebsd.org/changeset/base/328513

Log:
  Pull in r322245 from upstream clang trunk (by Craig Topper):

    [X86] Make -mavx512f imply -mfma and -mf16c in the frontend like it
    does in the backend.

    Similarly, make -mno-fma and -mno-f16c imply -mno-avx512f.

    Withou this  "-mno-sse -mavx512f" ends up with avx512f being enabled
    in the frontend but disabled in the backend.

  Reported by:  pawel
  PR:           225488

Changes:
  head/contrib/llvm/tools/clang/lib/Basic/Targets/X86.cpp

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