JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/controlFlowAnalysis/kt1219.1301.kt

@@ -0,0 +1,24 @@
+//KT-1219 Incorrect 'unused value' error in closures
+
+package kt1219
+
+fun <T, R> Iterable<T>.fold(var r: R, op: (T, R) -> R) : R {
+    this.foreach { r = op(it, r) } //unused value here
+    return r
+}
+
+//KT-1301 Modification of local of outer function in a local function should not be marked as unused assignment
+fun foo(){
+    var local = 0
+    fun bar(){
+        local = 1
+    }
+
+    bar()
+    System.out.println(local)
+}
+
+fun <T> Iterable<T>.foreach(operation: (element: T) -> Unit) {
+  for (elem in this)
+    operation(elem)
+}