[lldb][NFCI] Refactor AppleObjCClassDescriptorV2 method_t parsing functions (#163291) This rewrites ClassDescriptorV2::method_t::Read (and the loop calling that function) in an NFCI way to perform a couple of things: 1. Cleanup code with indirect style. For example, the old loop would have default-constructor a `unique_ptr<method_t>`, which was *reused* on every iteration of the loop. It called `method_t::Read` on each iteration, and never checked the return value prior to invoking the callback. In other words, if `Read` failed, the callback was called on random values. 2. Exposed memory reads that could benefit from the MultiMemoryRead packet proposed in [1]. [1]: https://discourse.llvm.org/t/rfc-a-new-vectorized-memory-read-packet/88441
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