[turbofan] Ship TF for class literals.

R=bmeurer@chromium.org
BUG=v8:4158
LOG=N

Review URL: https://codereview.chromium.org/1158883006

Cr-Commit-Position: refs/heads/master@{#28761}

src/ast-numbering.cc

@@ -416,7 +416,7 @@ void AstNumberingVisitor::VisitForStatement(ForStatement* node) {
 
 void AstNumberingVisitor::VisitClassLiteral(ClassLiteral* node) {
   IncrementNodeCount();
-  DisableOptimization(kClassLiteral);
+  DisableCrankshaft(kClassLiteral);
   node->set_base_id(ReserveIdRange(node->num_ids()));
   if (node->extends()) Visit(node->extends());
   if (node->constructor()) Visit(node->constructor());