Introduce is_debuggable state bit on function objects

runtime/vm/compiler.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 1146 matching lines @@
         false,  // not external
         false,  // not native
         Class::Handle(Type::Handle(Type::Function()).type_class()),
         fragment->token_pos()));
 
     func.set_result_type(Type::Handle(Type::DynamicType()));
     func.set_num_fixed_parameters(0);
     func.SetNumOptionalParameters(0, true);
     // Manually generated AST, do not recompile.
     func.SetIsOptimizable(false);
+    func.set_is_debuggable(false);
 
     // We compile the function here, even though InvokeFunction() below
     // would compile func automatically. We are checking fewer invariants
     // here.
     ParsedFunction* parsed_function = new ParsedFunction(isolate, func);
     parsed_function->SetNodeSequence(fragment);
     parsed_function->set_default_parameter_values(Object::null_array());
     fragment->scope()->AddVariable(parsed_function->EnsureExpressionTemp());
     fragment->scope()->AddVariable(
         parsed_function->current_context_var());
@@ skipping 13 matching lines @@
     const Object& result =
       PassiveObject::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart