JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/For.kt

@@ -0,0 +1,24 @@
+import java.util.HashMap
+
+fun bar(x: Int): Int = x + 1
+
+fun foo() {
+    val x: Int? = null
+    val a = Array<Int>(3, {0})
+
+    for (p in a) {
+        bar(<!TYPE_MISMATCH!>x<!>)
+        if (x == null) continue
+        bar(x)
+        for (q in a) {
+            bar(x)
+            if (<!SENSELESS_COMPARISON!>x == null<!>) bar(x)
+        }
+    }
+
+    for (p in a) {
+        bar(<!TYPE_MISMATCH!>x<!>)
+        if (x == null) break
+        bar(x)
+    }
+}