[lld] [CGData][lld-macho] Merge CG Data by LLD (PR #112674)

[Kyungwoo Lee via llvm-commits]

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@@ -1337,10 +1338,25 @@ static void codegenDataGenerate() {
       // Merge it to the global hash tree.
       globalOutlineRecord.merge(localOutlineRecord);
     }
+    if (isec->getSegName() == segment_names::data &&
+        isec->getName() == section_names::functionmap) {
+      // Read stable functions from each section.
+      StableFunctionMapRecord localMergeRecord;
+      auto *data = isec->data.data();
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kyulee-com wrote:

Yes because of `void deserialize(const unsigned char *&Ptr)` which modifies/advances the pointer. I added a comment above.

https://github.com/llvm/llvm-project/pull/112674