Bail out in AstTraversalVisitor::VisitFunctionBody for lazy functions

R=verwaest@chromium.org,mstarzinger@chromium.org
BUG=

Review-Url: https://chromiumcodereview.appspot.com/2425563003
Cr-Commit-Position: refs/heads/master@{#40442}

src/ast/ast-traversal-visitor.h

@@ -288,6 +288,8 @@ void AstTraversalVisitor<Subclass>::VisitFunctionLiteral(
   PROCESS_EXPRESSION(expr);
   DeclarationScope* scope = expr->scope();
   RECURSE_EXPRESSION(VisitDeclarations(scope->declarations()));
+  // A lazily parsed function literal won't have a body.
+  if (expr->scope()->is_lazily_parsed()) return;
   RECURSE_EXPRESSION(VisitStatements(expr->body()));
 }