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Commit f7188325 authored by Devang Patel's avatar Devang Patel
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Now Bitcode reader bug is fixed. Reapply 80839. 

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: 80868
parent 116b4a0c
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