[Bug 234480] devel/llvm70: Crashes with multimedia/aom >= 1.0.0.1109

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234480

--- Comment #14 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Sat Feb  9 12:01:11 UTC 2019
New revision: 343935
URL: https://svnweb.freebsd.org/changeset/base/343935

Log:
  MFC r342592:

  Pull in r342397 from upstream llvm trunk (by Amara Emerson):

    Revert "Revert r342183 "[DAGCombine] Fix crash when store merging
    created an extract_subvector with invalid index.""

    Fixed the assertion failure.

    Differential Revision: https://reviews.llvm.org/D51831

  This fixes 'Assertion failed: ((VT.getVectorNumElements() +
  N2C->getZExtValue() <= N1.getValueType().getVectorNumElements()) &&
  "Extract subvector overflow!"), function getNode' when building the
  multimedia/aom port (with AVX2 enabled).

  Reported by:  jbeich
  PR:           234480

Changes:
_U  stable/11/
  stable/11/contrib/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
_U  stable/12/
  stable/12/contrib/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

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