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By my estimation, these changes speed up DWARF unwinding when using the self-hosted x86_64 backend by around 7x. There are two very significant enhancements: we no longer iterate frames which don't fit in the stack trace buffer, and we cache register rules (in a fixed buffer) to avoid re-parsing and evaluating CFI instructions in most cases. Alongside this are a bunch of smaller enhancements, such as pre-caching the result of evaluating the CIE's initial instructions, avoiding re-parsing of CIEs, and big simplifications to the `Dwarf.Unwind.VirtualMachine` logic.