Kotlin: Add a Kotlin 2 copy of the testsuite

java/ql/test-kotlin2/library-tests/dataflow/foreach/C1.java

@@ -0,0 +1,22 @@
+public final class C1 {
+   public final String taint(String t) {
+      return t;
+   }
+
+   public final void sink(Object a) {
+   }
+
+   public final void test() {
+      String[] l = new String[]{this.taint("a"), ""};
+      this.sink(l);
+      this.sink(l[0]);
+
+      for(int i = 0; i < l.length; i++) {
+         this.sink(l[i]);
+      }
+
+      for (String s : l) {
+         this.sink(s);
+      }
+   }
+}