Remember deopt-id -> context-level mappings in var descriptors.

runtime/vm/dart.cc

 // Copyright (c) 2013, 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/dart.h"
 
 #include "vm/become.h"
 #include "vm/clustered_snapshot.h"
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
@@ skipping 650 matching lines @@
 // Different fields are included for DEBUG/RELEASE/PRODUCT.
 #if defined(DEBUG)
   buffer.AddString("debug");
 #elif defined(PRODUCT)
   buffer.AddString("product");
 #else
   buffer.AddString("release");
 #endif
 
   if (Snapshot::IncludesCode(kind)) {
+    if (FLAG_support_debugger) {
+      buffer.AddString(" support-debugger");
+    }
+
     // Checked mode affects deopt ids.
 #define ADD_FLAG(name, isolate_flag, flag)                                     \
   do {                                                                         \
     const bool name = (isolate != NULL) ? isolate->name() : flag;              \
     buffer.AddString(name ? (" " #name) : (" no-" #name));                     \
   } while (0);
     ISOLATE_FLAG_LIST(ADD_FLAG);
 #undef ADD_FLAG
 
 // Generated code must match the host architecture and ABI.
@@ skipping 85 matching lines @@
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 
 bool Dart::IsReadOnlyApiHandle(Dart_Handle handle) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->api_handles_.IsValidHandle(handle);
 }
 
 }  // namespace dart