fix style

Author: Davies Liu

sql/core/src/test/scala/org/apache/spark/sql/execution/BenchmarkWholeStageCodegen.scala

@@ -21,11 +21,11 @@ import org.apache.spark.{SparkConf, SparkContext, SparkFunSuite}
 import org.apache.spark.memory.{StaticMemoryManager, TaskMemoryManager}
 import org.apache.spark.sql.SQLContext
 import org.apache.spark.sql.catalyst.expressions.UnsafeRow
+import org.apache.spark.sql.functions._
 import org.apache.spark.unsafe.Platform
 import org.apache.spark.unsafe.hash.Murmur3_x86_32
 import org.apache.spark.unsafe.map.BytesToBytesMap
 import org.apache.spark.util.Benchmark
-import org.apache.spark.sql.functions._
 
 /**
   * Benchmark to measure whole stage codegen performance.