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Commit bcd960a1 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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IR: Don't drop MDNode uniquing on null operands 

Now that `LLVMContextImpl` can call `MDNode::dropAllReferences()` to
prevent teardown madness, stop dropping uniquing just because an operand
drops to null.

Part of PR21532.

llvm-svn: 225223
parent 6e6428d9
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