JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/controlFlowAnalysis/kt1001.kt

@@ -0,0 +1,34 @@
+//KT-1001 Argument 2 for @NotNull parameter of JetFlowInformationProvider.checkIsInitialized must not be null
+
+package kt1001
+
+fun foo(<!UNUSED_PARAMETER!>c<!>: Array<Int>) {
+    return
+
+    <!UNREACHABLE_CODE!>for (i in c) {}<!>
+    <!UNREACHABLE_CODE!>for (i in c) {}<!>
+}
+
+//more tests
+
+fun t1() : Int {
+    try {
+        return 1
+    }
+    catch (e : Exception) {
+        return 2
+    }
+    <!UNREACHABLE_CODE!>return 3<!>
+}
+
+fun t2() : Int {
+    try {
+        return 1
+    }
+    finally {
+        doSmth()
+    }
+    <!UNREACHABLE_CODE!>return 2<!>
+}
+
+fun doSmth() {}