[lld] [lld-macho] Fix duplicate GOT entries for personality functions (PR #95054)

[Vy Nguyen via llvm-commits]

oontvoo wrote:

> as personality functions are usually defined in platform runtime libraries.

Just wanted to point out that, we have seen a few use-cases that involve custom personality symbols (IOWs., they're user-defined symbols and  NOT in the  runtime libraries) . In fact, the `compact-unwind-both-local-and-dylib-personality.s` was testing some of that.

The change itself LGTM, though. 


https://github.com/llvm/llvm-project/pull/95054