JS backend: fix translation for || and && (create new tmp variable if needed)

js/js.translator/src/org/jetbrains/k2js/translate/operation/BinaryOperationTranslator.java

@@ -166,8 +166,14 @@ public final class BinaryOperationTranslator extends AbstractTranslator {
             return new JsBinaryOperation(operator, leftExpression, rightExpression);
         }
 
-        assert rightExpression instanceof JsNameRef : "expected JsNameRef, but " + expression.getText();
+        JsNameRef result;
-        JsNameRef result = (JsNameRef) rightExpression; // Reuse tmp variable
+        if (rightExpression instanceof JsNameRef) {
+            result = (JsNameRef) rightExpression; // Reuse tmp variable
+        } else {
+            TemporaryVariable resultVar = context().declareTemporary(rightExpression);
+            result = resultVar.reference();
+            rightBlock.getStatements().add(resultVar.assignmentExpression().makeStmt());
+        }
 
         JsIf ifStatement;
         if (token.equals(JetTokens.ANDAND)) {

js/js.translator/testData/expression/evaluationOrder/cases/orOrWithSideEffect.kt

@@ -8,6 +8,8 @@ fun bar(s: String, value: Boolean): Boolean {
 }
 
 fun box(): String {
+    val a =  if (true || if(bar("A", false)) {2} else {3} == 0) { }
+    assertEquals("", global)
 
     // Simple || Simple
     global = ""