[lld] [lld-macho] Add swift support to ObjC category merger (PR #95124)

[Ellis Hoag via llvm-commits]

================
@@ -679,11 +679,16 @@ void ObjcCategoryMerger::parseProtocolListInfo(const ConcatInputSection *isec,
       (protocolCount * target->wordSize) +
       /*header(count)*/ protocolListHeaderLayout.totalSize +
       /*extra null value*/ target->wordSize;
-  assert(expectedListSize == ptrListSym->isec()->data.size() &&
+
+  // On Swift, the protocol list does not have the extra (unecessary) null value
+  uint32_t expectedListSizeSwift = expectedListSize - target->wordSize;
+
+  assert((expectedListSize == ptrListSym->isec()->data.size() ||
+          expectedListSizeSwift == ptrListSym->isec()->data.size()) &&
          "Protocol list does not match expected size");
 
   // Suppress unsuded var warning
-  (void)expectedListSize;
+  (void)expectedListSize, (void)expectedListSizeSwift;
----------------
ellishg wrote:

Instead can we add `[[maybe_unused]]` to the declaration?

https://github.com/llvm/llvm-project/pull/95124