JS: fix generation of source map for inline lambda with ignored result

See KT-21309

js/js.inliner/src/org/jetbrains/kotlin/js/inline/util/rewriters/ReturnReplacingVisitor.kt

@@ -49,7 +49,10 @@ class ReturnReplacingVisitor(
             if (returnExpression != null && returnExpression.isTailCallSuspend) {
                 returnReplacement.isSuspend = true
             }
-            ctx.addNext(JsExpressionStatement(returnReplacement.apply { source = x.source }))
+            if (returnReplacement.source == null) {
+                returnReplacement.source = x.source
+            }
+            ctx.addNext(JsExpressionStatement(returnReplacement))
         }
 
         if (breakLabel != null) {
@@ -70,7 +73,7 @@ class ReturnReplacingVisitor(
         }
     }
 
-    fun processCoroutineResult(expression: JsExpression?): JsExpression? {
+    private fun processCoroutineResult(expression: JsExpression?): JsExpression? {
         if (!isSuspend) return expression
         if (expression != null && expression.isTailCallSuspend) return expression
         val lhs = JsNameRef("\$\$coroutineResult\$\$", JsAstUtils.stateMachineReceiver()).apply { coroutineResult = true }

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

@@ -228,6 +228,12 @@ public class JsLineNumberTestGenerated extends AbstractJsLineNumberTest {
         doTest(fileName);
     }
 
+    @TestMetadata("lastExpressionInInlineLambda.kt")
+    public void testLastExpressionInInlineLambda() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/lineNumbers/lastExpressionInInlineLambda.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("literals.kt")
     public void testLiterals() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/lineNumbers/literals.kt");

js/js.translator/testData/lineNumbers/lastExpressionInInlineLambda.kt

@@ -0,0 +1,27 @@
+fun foo() {
+    bar {
+        try {
+            baz()
+        }
+        catch (e: RuntimeException) {
+            e.toString()
+        }
+    }
+
+    bar {
+        when (boo()) {
+            "boo" -> baz()
+            else -> "111"
+        }
+    }
+}
+
+inline fun bar(x: () -> String): String {
+    return x()
+}
+
+fun baz() = "baz"
+
+fun boo() = "boo"
+
+// LINES: 17 4 6 6 7 7 3 3 3 * 13 12 13 13 14 21 20 20 23 23 23 25 25 25