[lld] [lld-macho] Add flag --keep-icf-stabs to LLD for MachO (PR #93137)

[Kyungwoo Lee via llvm-commits]

================
@@ -85,6 +85,9 @@ def icf_eq: Joined<["--"], "icf=">,
     HelpText<"Set level for identical code folding (default: none)">,
     MetaVarName<"[none,safe,all]">,
     Group<grp_lld>;
+def keep_icf_stabs: Joined<["--"], "keep-icf-stabs">,
----------------
kyulee-com wrote:

`stabs` seems confusing as it appears a single word, but in fact it stands for `symbol table`?
Can we say `keep-icf-symbol` or something? Likewise, I'd use more descriptive word in the following, instead of using `stabs entries` below.

https://github.com/llvm/llvm-project/pull/93137