6a884a9aef
Previously, the list of libc++abi symbols that we re-export from libc++ would be partly encoded in libc++abi (and re-exported automatically via the cxxabi-reexports target), and partly hard-coded in libcxx/lib/libc++abi.exp. The duplication of information led to symbols not being exported from libc++ after being added to libc++abi when they should have been. This patch removes the duplication of information. After this patch, the full list of symbols to re-export from libc++abi is handled by the cxxabi-reexports target and is stored in libcxxabi. The symbols newly re-exported from libc++ are mainly new fundamental typeinfos and a bunch of functions and classes that are part of libc++abi but are most likely implementation details. In the future, it would be possible to try to trim down the set of what we export from libc++abi (and hence what we re-export from libc++) to remove some implementation detail symbols. Fixes #79008
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