[Bug 238082] graphics/mesa-dri: clang 8 (from head at r347549) crashes during build on powerpc64 (WITH_CLANG_IS_CC)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238082

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

Author: dim
Date: Sun May 26 15:44:58 UTC 2019
New revision: 348288
URL: https://svnweb.freebsd.org/changeset/base/348288

Log:
  Pull in r361696 from upstream llvm trunk (by Sanjay Patel):

    [SelectionDAG] soften assertion when legalizing narrow vector FP ops

    The test based on PR42010:
    https://bugs.llvm.org/show_bug.cgi?id=42010

    ...may show an inaccuracy for PPC's target defs, but we should not be
    so aggressive with an assert here. There's no telling what
    out-of-tree targets look like.

  This fixes an assertion when building the graphics/mesa-dri port for
  PowerPC64.

  Reported by:  Mark Millard <marklmi26-fbsd at yahoo.com>
  PR:           238082
  MFC after:    3 days

Changes:
  head/contrib/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp

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