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dim
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V 27
2017-01-16T19:53:18.727551Z
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V 757
Pull in r292133 from upstream llvm trunk (by Hal Finkel):

  Fix use-after-free bug in AffectedValueCallbackVH::allUsesReplacedWith

  When transferring affected values in the cache from an old value,
  identified by the value of the current callback, to the specified new
  value we might need to insert a new entry into the DenseMap which
  constitutes the cache. Doing so might delete the current callback
  object. Move the copying logic into a new function, a member of the
  assumption cache itself, so that we don't run into UB should the
  callback handle itself be removed mid-copy.

  Differential Revision: https://reviews.llvm.org/D28749

This should fix crashes when building lld (as part of the llvmXY ports).

Reported by:	jbeich
PR:		216117

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