regenerate keyword strings; add testcase for 'interface' keyword

core/descriptors/src/org/jetbrains/kotlin/renderer/KeywordStringsGenerated.java

@@ -52,6 +52,7 @@ public class KeywordStringsGenerated {
         "do",
         "when",
         "trait",
+        "interface",
         "This"
     ));
 }

generators/src/org/jetbrains/kotlin/generators/tests/generateTestDataForReservedWords.kt

@@ -58,6 +58,7 @@ fun box(): String {
 
             case("class", "class $KEYWORD_MARKER { companion object {} }", "", testNotRenamedByName)
             case("trait", "trait $KEYWORD_MARKER { companion object {} }", "", testNotRenamedByName)
+            case("interface", "interface $KEYWORD_MARKER { companion object {} }", "", testNotRenamedByName)
             case("enum", "enum class $KEYWORD_MARKER { foo }", "", testNotRenamed("$KEYWORD_MARKER.foo"))
             case("object", "object $KEYWORD_MARKER {}", "", testNotRenamedByName)
         }