[lld] [lld-macho][NFC] Preserve original symbol isec, unwindEntry and size (PR #88357)

[Jez Ng via llvm-commits]

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@@ -182,14 +184,17 @@ class Defined : public Symbol {
   const bool external : 1;
 
 public:
-  InputSection *isec;
+  // The native InputSection of the symbol. The symbol may be moved to another
+  // InputSection in which originalIsec->canonical() will point to the new
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int3 wrote:

s/in which/in which case/

https://github.com/llvm/llvm-project/pull/88357