JS: fix parsing of object literals in js() function.

Also, fix generation of source maps of content of js() function.

See KT-19794

js/js.tests/test/org/jetbrains/kotlin/js/test/JsLineNumberTestGenerated.java

@@ -216,6 +216,12 @@ public class JsLineNumberTestGenerated extends AbstractJsLineNumberTest {
         doTest(fileName);
     }
 
+    @TestMetadata("jsCode.kt")
+    public void testJsCode() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/lineNumbers/jsCode.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("lambdaWithClosure.kt")
     public void testLambdaWithClosure() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/lineNumbers/lambdaWithClosure.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -5516,6 +5516,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("objectExpression.kt")
+        public void testObjectExpression() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/jsCode/objectExpression.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("objectScopes.kt")
         public void testObjectScopes() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/jsCode/objectScopes.kt");