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Rewrite `DIEValueList` as a subclass of `DIE`, renaming its API to match `DIE`'s. This is preparation for changing `DIEBlock` and `DIELoc` to stop inheriting from `DIE` and inherit directly from `DIEValueList`. I thought about leaving this as a has-a relationship (and changing `DIELoc` and `DIEBlock` to also have-a `DIEValueList`), but that seemed to require a fair bit more boilerplate and I think it needed more changes to the `DwarfUnit` API than this will. No functionality change intended here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243854 91177308-0d34-0410-b5e6-96231b3b80d8