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20dd053160
Starting with https://github.com/llvm/llvm-project/pull/154686 the compressed_pair children are now wrapped in an anonymous structure. This patch adjusts the LLDB data-formatters to support that. Outstanding questions: 1. Should GetChildMemberWithName look through anonymous structures? That will break users most likely. But maybe introducing a new API is worth it? Then we wouldnt have to do this awkward passing around of `anon_struct_index` 2. Do we support the layout without the anonymous structure? It's not too much added complexity. And we did release that version of libc++, so there is code out there compiled against it. But there is no great way of testing it (some of our macOS matrix bots do test it i suppose, but not in a targeted way). We have the layout "simulator" tests for some of the STL types which I will adjust.