[minor] Fixed unit test as per 1.6

Author: Kapil Singh

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CodeGenerationSuite.scala

@@ -82,12 +82,12 @@ class CodeGenerationSuite extends SparkFunSuite with ExpressionEvalHelper {
 
   test("SPARK-18091: split large if expressions into blocks due to JVM code size limit") {
     var strExpr: Expression = Literal("abc")
-    for (_ <- 1 to 150) {
+    for (_ <- 1 to 100) {
       strExpr = Decode(Encode(strExpr, "utf-8"), "utf-8")
     }
 
     val expressions = Seq(If(EqualTo(strExpr, strExpr), strExpr, strExpr))
-    val plan = GenerateMutableProjection.generate(expressions)
+    val plan = GenerateMutableProjection.generate(expressions)()
     val actual = plan(null).toSeq(expressions.map(_.dataType))
     val expected = Seq(UTF8String.fromString("abc"))