Kotlin: Add a Kotlin 2 copy of the testsuite

java/ql/test-kotlin2/query-tests/DeadCode/DeadClass.qlref

@@ -0,0 +1 @@
+DeadCode/DeadClass.ql

java/ql/test-kotlin2/query-tests/DeadCode/DeadMethod.qlref

@@ -0,0 +1 @@
+DeadCode/DeadMethod.ql

java/ql/test-kotlin2/query-tests/DeadCode/Test.kt

@@ -0,0 +1,31 @@
+sealed interface DbAddexpr
+
+class Label<T> {
+}
+
+fun <T> getFreshIdLabel(): Label<T> {
+    return Label()
+}
+
+fun foo(): Label<DbAddexpr> {
+    val x = getFreshIdLabel<DbAddexpr>()
+    return x
+}
+
+fun main1() {
+    print(foo())
+}
+
+class Foo {
+    data class DC(val x: Int, val y: Int)
+
+    fun foo() {
+        val dc = DC(3, 4)
+        print(dc.x)
+        print(dc.y)
+    }
+}
+
+fun main2() {
+    Foo().foo()
+}