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73e3fb6ba8
Change `DIE::Values` to a singly linked list, where each node is allocated on a `BumpPtrAllocator`. In order to support `push_back()`, the list is circular, and points at the tail element instead of the head. I abstracted the core list logic out to `IntrusiveBackList` so that it can be reused for `DIE::Children`, which also cares about `push_back()`. This drops llc memory usage from 799 MB down to 735 MB, about 8%. (I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`; see r236629 for details.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240733 91177308-0d34-0410-b5e6-96231b3b80d8 |
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