We can't print the AST or the source for stubs.

BUG=v8:2486

Review URL: https://codereview.chromium.org/11881017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13366 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/codegen.cc

@@ -86,12 +86,12 @@ void CodeGenerator::MakeCodePrologue(CompilationInfo* info) {
     PrintF(" ***\n");
   }
 
-  if (print_source) {
+  if (!info->IsStub() && print_source) {
     PrintF("--- Source from AST ---\n%s\n",
            PrettyPrinter().PrintProgram(info->function()));
   }
 
-  if (print_ast) {
+  if (!info->IsStub() && print_ast) {
     PrintF("--- AST ---\n%s\n",
            AstPrinter().PrintProgram(info->function()));
   }