[PATCH] D32634: Emulate TrackingVH using WeakVH

[Sanjoy Das via Phabricator via llvm-commits]

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

This frees up one slot in the HandleBaseKind enum, which I will use
later to add a new kind of value handle.  The size of the
HandleBaseKind enum is important because we store a HandleBaseKind in
the low two bits of a (in the worst case) 4 byte aligned pointer.


https://reviews.llvm.org/D32634

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

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