[Bug 234987] clang 6.0.1 coredump on gtk-gnutella

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234987

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A commit references this bug:

Author: dim
Date: Wed Jan 16 20:38:18 UTC 2019
New revision: 343102
URL: https://svnweb.freebsd.org/changeset/base/343102

Log:
  Pull in r337861 from upstream llvm trunk (by Hideki Saito):

    [LV] Fix for PR38110, LV encountered llvm_unreachable()

    Summary: truncateToMinimalBitWidths() doesn't handle all Instructions
    and the worst case is compiler crash via llvm_unreachable(). Fix is
    to add a case to handle PHINode and changed the worst case to NO-OP
    (from compiler crash).

    Reviewers: sbaranga, mssimpso, hsaito

    Reviewed By: hsaito

    Subscribers: llvm-commits

    Differential Revision: https://reviews.llvm.org/D49461

  This should fix "Unhandled instruction type!" (if assertions are
  enabled) or segmentation faults (if assertions are disabled) when
  compiling certain versions of the net-p2p/gtk-gnutella port.

  Direct commit to stable/11 and stable/12, since head already has this
  fix.

  Reported by:  Jamie Landeg-Jones <jamie at catflap.org>
  PR:           234987

Changes:
  stable/11/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  stable/12/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

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