[ELF] Replace one make_unique from r316378 with a stack object. NFC

GitOrigin-RevId: 7ea662e2dda021bfc4c68354a5fe359748dd4ce4
diff --git a/ELF/LinkerScript.cpp b/ELF/LinkerScript.cpp
index 40befb6..9de5125 100644
--- a/ELF/LinkerScript.cpp
+++ b/ELF/LinkerScript.cpp
@@ -1327,8 +1327,8 @@
     dot += getHeaderSize();
   }
 
-  auto deleter = std::make_unique<AddressState>();
-  ctx = deleter.get();
+  AddressState state;
+  ctx = &state;
   errorOnMissingSection = true;
   switchTo(aether);