Generate JS source map for if statement got from optional argument

js/js.translator/src/org/jetbrains/kotlin/js/translate/utils/FunctionBodyTranslator.java

@@ -91,6 +91,7 @@ public final class FunctionBodyTranslator extends AbstractTranslator {
             JsBinaryOperation checkArgIsUndefined = equality(jsNameRef, Namer.getUndefinedExpression());
             checkArgIsUndefined.source(KotlinSourceElementKt.getPsi(valueParameter.getSource()));
             JsIf jsIf = JsAstUtils.newJsIf(checkArgIsUndefined, thenStatement);
+            jsIf.setSource(checkArgIsUndefined.getSource());
             result.add(jsIf);
         }
 

js/js.translator/testData/lineNumbers/complexExpressionAsDefaultArgument.kt

@@ -11,4 +11,4 @@ fun baz() = 1
 
 fun bar() = 2
 
-// LINES: 8 * 2 3 4 4 5 2 8 10 10 12 12
+// LINES: 8 * 2 2 3 4 4 5 2 8 10 10 12 12

js/js.translator/testData/lineNumbers/memberFunWithDefaultParam.kt

@@ -10,4 +10,4 @@ class B : A() {
     }
 }
 
-// LINES: 1 2 2 2 2 2 2 4 4 * 7 7 10 9
+// LINES: 1 2 2 2 2 2 2 2 4 4 * 7 7 10 9

js/js.translator/testData/lineNumbers/optionalArgs.kt

@@ -7,4 +7,4 @@ fun box(
     println(y)
 }
 
-// LINES: 8 2 2 3 3 4 6 7
+// LINES: 8 2 2 2 3 3 3 4 6 7