[Bug 228261] Request for a specific llvm commit to be merged into current and llvm60 port

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228261

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Thu May 17 14:38:58 UTC 2018
New revision: 333715
URL: https://svnweb.freebsd.org/changeset/base/333715

Log:
  Pull in r322325 from upstream llvm trunk (by Matthias Braun):

    PeepholeOpt cleanup/refactor; NFC

    - Less unnecessary use of `auto`
    - Add early `using RegSubRegPair(AndIdx) =` to avoid countless
      `TargetInstrInfo::` qualifications.
    - Use references instead of pointers where possible.
    - Remove unused parameters.
    - Rewrite the CopyRewriter class hierarchy:
       - Pull out uncoalescable copy rewriting functionality into
         PeepholeOptimizer class.
       - Use an abstract base class to make it clear that rewriters are
         independent.
    - Remove unnecessary \brief in doxygen comments.
    - Remove unused constructor and method from ValueTracker.
    - Replace UseAdvancedTracking of ValueTracker with DisableAdvCopyOpt
      use.

  Even though upstream marked this as "No Functional Change", it does
  contain some functional changes, and these fix a compiler hang for one
  particular source file in the devel/godot port.

  PR:           228261
  MFC after:    3 days

Changes:
  head/contrib/llvm/lib/CodeGen/PeepholeOptimizer.cpp

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