JetDiagnosticsTest migrated to TestGenerator

- test data files renamed from *.jet to *.kt

compiler/testData/diagnostics/tests/PrimaryConstructors.kt

@@ -0,0 +1,29 @@
+class X {
+  <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val x : Int<!>
+}
+
+open class Y() {
+  val x : Int = 2
+}
+
+class Y1 {
+  val x : Int get() = 1
+}
+
+class Z : Y() {
+}
+
+//KT-650 Prohibit creating class without constructor.
+
+class MyIterable<T> : Iterable<T>
+{
+    override fun iterator(): Iterator<T>  = MyIterator()
+
+    class MyIterator : Iterator<T>
+    {
+        override val hasNext: Boolean = false
+        override fun next(): T {
+            throw UnsupportedOperationException()
+        }
+    }
+}