Add regression test for KT-3634

#KT-3634 Obsolete

compiler/testData/codegen/box/unit/kt3634.kt

@@ -0,0 +1,8 @@
+val c = Unit.VALUE
+val d = c
+
+fun box(): String {
+    c
+    d
+    return "OK"
+}

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -4792,6 +4792,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.GenerateTests", new File("compiler/testData/codegen/box/unit"), Pattern.compile("^(.+)\\.kt$"), true);
         }
         
+        @TestMetadata("kt3634.kt")
+        public void testKt3634() throws Exception {
+            doTest("compiler/testData/codegen/box/unit/kt3634.kt");
+        }
+        
         @TestMetadata("kt4212.kt")
         public void testKt4212() throws Exception {
             doTest("compiler/testData/codegen/box/unit/kt4212.kt");