Detect recursion during compilation of const constructors.

runtime/vm/raw_object.h

 // 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.
 
 #ifndef VM_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 500 matching lines @@
   intptr_t token_index_;
   intptr_t end_token_index_;
   intptr_t num_fixed_parameters_;
   intptr_t num_optional_parameters_;
   intptr_t usage_counter_;  // Incremented while function is running.
   intptr_t deoptimization_counter_;
   Kind kind_;
   bool is_static_;
   bool is_const_;
   bool is_optimizable_;
+  bool is_compiling_;  // True while this function is being compiled.
 };
 
 
 class RawField : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Field);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
   RawString* name_;
   RawClass* owner_;
   RawAbstractType* type_;
@@ skipping 636 matching lines @@
   intptr_t type_;  // Uninitialized, simple or complex.
   intptr_t flags_;  // Represents global/local, case insensitive, multiline.
 
   // Variable length data follows here.
   uint8_t data_[0];
 };
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_