[Bug 226388] java/openjdk8: work around a clang6 bug on armv6 and armv7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226388

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Fri Mar  9 09:21:22 UTC 2018
New revision: 330686
URL: https://svnweb.freebsd.org/changeset/base/330686

Log:
  Pull in r326882 from upstream llvm trunk (by Sjoerd Meijer):

    [ARM] Fix for PR36577

    Don't PerformSHLSimplify if the given node is used by a node that
    also uses a constant because we may get stuck in an infinite combine
    loop.

    bugzilla: https://bugs.llvm.org/show_bug.cgi?id=36577

    Patch by Sam Parker.

    Differential Revision: https://reviews.llvm.org/D44097

  This fixes a hang when compiling one particular file in java/openjdk8
  for armv6 and armv7.

  Reported by:  swills
  PR:           226388

Changes:
  head/contrib/llvm/lib/Target/ARM/ARMISelLowering.cpp

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