Extend assembler with ability to produce comments for the generated code.

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 693 matching lines @@
 
   RawObject** from() {
     return reinterpret_cast<RawObject**>(&ptr()->instructions_);
   }
   RawInstructions* instructions_;
   RawFunction* function_;
   RawExceptionHandlers* exception_handlers_;
   RawPcDescriptors* pc_descriptors_;
   RawArray* stackmaps_;
   RawLocalVarDescriptors* var_descriptors_;
+  RawArray* comments_;
   RawObject** to() {
-    return reinterpret_cast<RawObject**>(&ptr()->var_descriptors_);
+    return reinterpret_cast<RawObject**>(&ptr()->comments_);
   }
 
   intptr_t pointer_offsets_length_;
   // This cannot be boolean because of alignment issues on x64 architectures.
   intptr_t is_optimized_;
 
   // Variable length data follows here.
   int32_t data_[0];
 
   friend class StackFrame;
@@ skipping 769 matching lines @@
          kExternalUint64Array == kByteArray + 18 &&
          kExternalFloat32Array == kByteArray + 19 &&
          kExternalFloat64Array == kByteArray + 20 &&
          kClosure == kByteArray + 21);
   return (index >= kByteArray && index <= kClosure);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_