Fix and add compilation test for dotty-bench

Author: nicolasstucki

.drone.yml

@@ -14,13 +14,15 @@ pipeline:
     commands:
       - cp -R . /tmp/1/ && cd /tmp/1/
       - ./project/scripts/sbt test
+      - ./project/scripts/sbt ";dotty-bench/jmh:run 1 1 tests/run/arrays.scala"
 
   test_bootstrapped:
     group: test
     image: lampepfl/dotty:2017-09-08
     commands:
       - cp -R . /tmp/2/ && cd /tmp/2/
       - ./project/scripts/sbt dotty-bootstrapped/test
+      - ./project/scripts/sbt ";dotty-bench-bootstrapped/jmh:run 1 1 tests/run/arrays.scala"
 
   test_optimised:
     group: test

bench/src/main/scala/Benchmarks.scala

@@ -25,7 +25,7 @@ object Bench {
     val (intArgs, args1) = args.span(x => try { x.toInt; true } catch { case _: Throwable => false } )
 
     val warmup = if (intArgs.length > 0) intArgs(0).toInt else 30
-    val iteration warmup = if (intArgs.length > 1) intArgs(1).toInt else 20
+    val iterations = if (intArgs.length > 1) intArgs(1).toInt else 20
 
     val args2 = args1.map { arg =>
       if ((arg.endsWith(".scala") || arg.endsWith(".java")) && arg.head != '/') "../" + arg