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Duncan P. N. Exon Smith
97d1c07c15
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225223 91177308-0d34-0410-b5e6-96231b3b80d8
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