Update codeflash/code_utils/deduplicate_code.py

Co-authored-by: codeflash-ai[bot] <148906541+codeflash-ai[bot]@users.noreply.github.com>

Author: misrasaurabh1

codeflash/code_utils/deduplicate_code.py

@@ -66,8 +66,8 @@ def visit_ImportFrom(self, node):
 
     def visit_Global(self, node):
         """Track global variable declarations"""
-        for name in node.names:
-            self.global_vars.add(name)
+        # Avoid repeated .add calls by using set.update with list
+        self.global_vars.update(node.names)
         return node
 
     def visit_Nonlocal(self, node):