[lldb] [llvm] [lldb] Encode operands and arity in Dwarf.def and use them in LLDB. (PR #94679)

[Jonas Devlieghere via llvm-commits]

JDevlieghere wrote:

The number of operands comes directly from Table 7.6 in the DWARF 5 spec. I'm less confident in the _arity_ which required me to consult the description of the operations. I think I got them right and everything covered by the LLDB test suite still passes, but I would definitely appreciate a second pair of eyes on this. 

https://github.com/llvm/llvm-project/pull/94679