[lld][NFC] Revert commit ccec22b675195bf. (#76398)

This reverts commit ccec22b675195bf45a5e34583a866ab881f94dde (#75183).
It's no longer needed with #76251.

GitOrigin-RevId: dc5fb32547627223967f11fa08886045bba804f5
diff --git a/COFF/Writer.cpp b/COFF/Writer.cpp
index 2982165..2e34a6c 100644
--- a/COFF/Writer.cpp
+++ b/COFF/Writer.cpp
@@ -560,7 +560,7 @@
   codeMap.clear();
 
   std::optional<chpe_range_type> lastType;
-  Chunk *first = nullptr, *last = nullptr;
+  Chunk *first, *last;
 
   auto closeRange = [&]() {
     if (lastType) {