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`__xlcxx_personality_v0` is the personality routine in `libc++abi` for the EH of applications generated by the legacy IBM C++ compiler. Since the EH info generated by the legacy compiler does not provide the location of the personality routine, this routine is hard-coded as the handler for legacy EH in the unwinder. The symbol is resolved dynamically using `dlopen()` to avoid a hard dependency of `libunwind` on `libc++abi` for cases such as non-C++ applications. The weak declaration of `__xlcxx_personality_v0` was originally intended to bypass `dlopen()` if the C++ application generated by the legacy compiler is statically linked with the new LLVM C++ compiler. Unfortunately, this causes problems with runtime linking for Clang-compiled code using the unwinder that does not link with `libc++abi`. On the other hand, the C++ runtime libraries shipped for AIX are actually stripped and statically linking is not supported. So, we can fix the problem by removing the `__xlcxx_personality_v0` weak declaration. Besides, `dlopen()` would work as long as the libc++abi shared library is available.
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