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If this is a problem for anyone (shared_ptr is two pointers in size, whereas IntrusiveRefCntPtr is 1 - and the ref count control block that make_shared adds is probably larger than the one int in RefCountedBase) I'd prefer to address this by adding a lower-overhead version of shared_ptr (possibly refactoring IntrusiveRefCntPtr into such a thing) to avoid the intrusiveness - this allows memory ownership to remain orthogonal to types and at least to me, seems to make code easier to understand (since no implicit ownership acquisition can happen). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291006 91177308-0d34-0410-b5e6-96231b3b80d8