[PATCH] D32267: Add a new WeakVH value handle; NFC

[Sanjoy Das via Phabricator via llvm-commits]

sanjoy created this revision.
Herald added a subscriber: mcrosier.

WeakVH nulls itself out if the value it was tracking gets deleted, but
it does not track RAUW.


https://reviews.llvm.org/D32267

Files:
  include/llvm/IR/ValueHandle.h
  lib/IR/Value.cpp
  unittests/IR/ValueHandleTest.cpp

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