Mark Code objects as not optimizable if their FunctionLiteral contains unoptimizable AST nodes.

src/ast.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1043 matching lines @@
 
 
 void AstConstructionVisitor::VisitForStatement(ForStatement* node) {
   increase_node_count();
   add_flag(kDontSelfOptimize);
 }
 
 
 void AstConstructionVisitor::VisitForInStatement(ForInStatement* node) {
   increase_node_count();
-  add_flag(kDontOptimize);
-  add_flag(kDontInline);
   add_flag(kDontSelfOptimize);
 }
 
 
 void AstConstructionVisitor::VisitTryCatchStatement(TryCatchStatement* node) {
   increase_node_count();
   add_flag(kDontOptimize);
   add_flag(kDontInline);
 }
 
@@ skipping 77 matching lines @@
     OS::SNPrintF(buffer, "%d", Smi::cast(*handle_)->value());
     str = arr;
   } else {
     str = DoubleToCString(handle_->Number(), buffer);
   }
   return FACTORY->NewStringFromAscii(CStrVector(str));
 }
 
 
 } }  // namespace v8::internal