Kotlin: fix for-loop iterators over primitive or wildcard types

Array<*> can't be queried for an argument type, and IntArray doesn't have an argument at all; both were previously causing the extractor to fail to extract the whole file due to throwing an exception.

java/ql/test/kotlin/library-tests/for-array-iterators/test.expected

@@ -0,0 +1,9 @@
+| test.kt:5:14:5:14 | hasNext(...) |
+| test.kt:5:14:5:14 | iterator(...) |
+| test.kt:5:14:5:14 | next(...) |
+| test.kt:6:14:6:14 | hasNext(...) |
+| test.kt:6:14:6:14 | iterator(...) |
+| test.kt:6:14:6:14 | next(...) |
+| test.kt:7:14:7:14 | hasNext(...) |
+| test.kt:7:14:7:14 | iterator(...) |
+| test.kt:7:14:7:14 | next(...) |

java/ql/test/kotlin/library-tests/for-array-iterators/test.kt

@@ -0,0 +1,11 @@
+fun test(x: Array<String>, y: Array<*>, z: IntArray): Int {
+
+  var ret = 0
+
+  for (el in x) { ret += 1 }
+  for (el in y) { ret += 1 }
+  for (el in z) { ret += 1 }
+
+  return ret 
+
+}

java/ql/test/kotlin/library-tests/for-array-iterators/test.ql

@@ -0,0 +1,4 @@
+import java
+
+from MethodAccess ma
+select ma