…LIBCXX_CXX_ABI choice Instead of having complicated options like LIBCXX_ENABLE_STATIC_ABI_LIBRARY and LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY, introduce a more general mechanism to select the ABI library used by libc++. The new mechanism allows specifying the ABI library for the static libc++ and the shared libc++ separately, and allows selecting a "merged" flavor of libc++ for both the in-tree libc++abi and any external static ABI library. As an example, one can now specify arbitrary combinations like -DLIBCXX_ABILIB_FOR_SHARED="shared-libcxxabi" -DLIBCXX_ABILIB_FOR_STATIC="merged-libcxxabi" which would have been impossible or very brittle in the past. In theory, one can even select an entirely different ABI library for the static and the shared libc++ (e.g. libc++abi vs libsupc++), although supporting that is not a primary goal of this patch but merely a result of the general mechanism. Closes llvm#77655 Fixes llvm#57759 Differential Revision: https://reviews.llvm.org/D125683

[D125683] [runtimes] Replace LIBCXX_ENABLE_STATIC_ABI_LIBRARY & friends by a new LIBCXX_CXX_ABI choice #77655

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