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Commit 36309cd3 authored by Devang Patel's avatar Devang Patel
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Use CallbackVH, instead of WeakVH, to hold MDNode elements. 

Use FoldingSetNode to unique MDNodes in a context.
Use CallbackVH hooks to update context's MDNodeSet appropriately.

llvm-svn: 80839
parent f0da41c3
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