[lld] [lld-macho] Include branch extension thunks in linker map (PR #120496)

[via llvm-commits]

================
@@ -220,7 +242,12 @@ void macho::writeMapFile() {
   os << "# Address\tSize    \tFile  Name\n";
   for (const OutputSegment *seg : outputSegments) {
     for (const OutputSection *osec : seg->getSections()) {
-      if (auto *concatOsec = dyn_cast<ConcatOutputSection>(osec)) {
+      const TextOutputSection *textOsec = dyn_cast<TextOutputSection>(osec);
+      if (textOsec && textOsec->getThunks().size()) {
+        auto inputsAndThunks =
+            mergeOrderedInputs(textOsec->inputs, textOsec->getThunks());
+        printIsecArrSyms(inputsAndThunks);
+      } else if (auto *concatOsec = dyn_cast<ConcatOutputSection>(osec)) {
         printIsecArrSyms(concatOsec->inputs);
----------------
alx32 wrote:

Switched `mergeOrderedInputs` to use `std::merge`. Leaving the rest as-is for now - We can reopen the conversation via another comment. 

https://github.com/llvm/llvm-project/pull/120496