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Emulate TrackingVH using WeakVH (#6662)
This PR pulls the upstream change, Emulate TrackingVH using WeakVH (llvm/llvm-project@8a62382), into DXC. Here's the summary of the change: > 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. > > Reviewers: davide, chandlerc > > Subscribers: mcrosier, llvm-commits > > Differential Revision: https://reviews.llvm.org/D32634 This is part 2 of the fix for #6659.
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