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ea614a5025
There were two major problems with `MDNode` memory management.
1. `MDNode::operator new()` called a placement array constructor for
`MDOperand`. What? Each operand needs to be placed individually.
2. `MDNode::operator delete()` failed to destruct the `MDOperand`s at
all.
Frankly it's hard to understand how this worked locally, how this
survived an LTO bootstrap, or how it worked on most of the bots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223858 91177308-0d34-0410-b5e6-96231b3b80d8
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