JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/regressions/Jet81.kt

@@ -0,0 +1,22 @@
+// JET-81 Assertion fails when processing self-referring anonymous objects
+
+val y = object {
+  val a = <!TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM!>y<!>;
+}
+
+val z = y.a;
+
+object A {
+  val x = A
+}
+
+val a = object {
+  {
+    b + 1
+  }
+  val x = b
+  val y = 1
+}
+
+val b = <!TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM!>a<!>.x
+val c = a.y