[lld-macho] Fix STABS entries for `--icf=safe_thunks` and `--keep-icf-stabs` (#133179) When using the linker flags `--icf=safe_thunks` and `--keep-icf-stabs` together, an issue arises with the STABS debugging entries in the linked output. The problem affects STABS entries for functions that are folded via ICF using thunks. For instance, if `func1` is merged into `func2` through a thunk, the STABS entry for `func1` incorrectly points to the object file of `func2`. This is incorrect behavior—each function’s STABS entry should consistently point to its own original object file (e.g., the STABS entry for `func1` should reference `func1`’s object file). This issue causes `dsymutil` to not be able to retrieve the debug information for the problematic function. This patch corrects this behavior - making it so that STABS entries always point to the correct object file.
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