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023c72e64a
Having the operands at the back prevents subclasses from safely adding fields. Move them to the front. Instead of replicating the custom `malloc()`, `free()` and `DestroyFlag` logic that was there before, overload `new` and `delete`. I added calls to a new `GenericMDNode::dropAllReferences()` in `LLVMContextImpl::~LLVMContextImpl()`. There's a maze of callbacks happening during teardown, and this resolves them before we enter the destructors. Part of PR21532. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222211 91177308-0d34-0410-b5e6-96231b3b80d8
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