[Bug 236568] devel/xwpe: clang 8 crashes during build on armv7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236568

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Sat Mar 23 14:10:06 UTC 2019
New revision: 345449
URL: https://svnweb.freebsd.org/changeset/base/345449

Log:
  Pull in r356809 from upstream llvm trunk (by Eli Friedman):

    [ARM] Don't form "ands" when it isn't scheduled correctly.

    In r322972/r323136, the iteration here was changed to catch cases at
    the beginning of a basic block... but we accidentally deleted an
    important safety check.  Restore that check to the way it was.

    Fixes https://bugs.llvm.org/show_bug.cgi?id=41116

    Differential Revision: https://reviews.llvm.org/D59680

  This should fix "Assertion failed: (LiveCPSR && "CPSR liveness tracking
  is wrong!"), function UpdateCPSRUse" errors when building the devel/xwpe
  port for armv7.

  PR:           236062, 236568
  MFC after:    1 month
  X-MFC-With:   r344779

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

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