llvm-project

dde26e36 - [libunwind][AIX] Call dlclose only when dlsym() fails (#112768)

[libunwind][AIX] Call dlclose only when dlsym() fails (#112768) The personality routine `__xlcxx_personality_v0` in `libc++abi` is hard-coded in the unwinder as the handler for EH in applications generated by the legacy IBM C++ compiler. The symbol is resolved dynamically using `dlopen` to avoid a hard dependency of `libunwind` on `libc++abi` for cases such as non-C++ applications. However, `dlclose` was incorrectly called after `dlsym` succeeded, potentially invalidating the function pointer obtained from `dlsym` when the memory allocated for the `dlopen` is reclaimed. This PR changes to call `dlclose` only when `dlsym` fails.