[lld] [lld][MachO] Prevent doubled N_SO when comp_dir and name absolute (PR #71608)

[Vincent Lee via llvm-commits]

================
@@ -0,0 +1,58 @@
+# REQUIRES: x86
----------------
thevinster wrote:

Is there a need to create a new test file for this use case? This seems like this could be placed in [`stabs.s`](https://github.com/llvm/llvm-project/blob/main/lld/test/MachO/stabs.s)

https://github.com/llvm/llvm-project/pull/71608