ASV: time_reindex_both_axes to reindex existing columns (#44667)

Author: jorisvandenbossche

asv_bench/benchmarks/frame_methods.py

@@ -76,7 +76,7 @@ def time_reindex_axis1_missing(self):
         self.df.reindex(columns=self.idx)
 
     def time_reindex_both_axes(self):
-        self.df.reindex(index=self.idx, columns=self.idx)
+        self.df.reindex(index=self.idx, columns=self.idx_cols)
 
     def time_reindex_upcast(self):
         self.df2.reindex(np.random.permutation(range(1200)))