Fix JS source maps for string literals

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

@@ -132,6 +132,12 @@ public class JsLineNumberTestGenerated extends AbstractJsLineNumberTest {
         doTest(fileName);
     }
 
+    @TestMetadata("stringLiteral.kt")
+    public void testStringLiteral() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/lineNumbers/stringLiteral.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("syntheticCodeInConstructors.kt")
     public void testSyntheticCodeInConstructors() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/lineNumbers/syntheticCodeInConstructors.kt");

js/js.translator/src/org/jetbrains/kotlin/js/translate/expression/ExpressionVisitor.java

@@ -320,7 +320,7 @@ public final class ExpressionVisitor extends TranslatorVisitor<JsNode> {
     public JsNode visitStringTemplateExpression(@NotNull KtStringTemplateExpression expression, @NotNull TranslationContext context) {
         JsStringLiteral stringLiteral = resolveAsStringConstant(expression, context);
         if (stringLiteral != null) {
-            return stringLiteral;
+            return stringLiteral.source(expression);
         }
         return resolveAsTemplate(expression, context).source(expression);
     }

js/js.translator/testData/lineNumbers/stringLiteral.kt

@@ -0,0 +1,7 @@
+fun box(x: Int): String {
+    return "" +
+           x +
+           "suffix"
+}
+
+// LINES: 2 3 4