When marking dependent code for deoptimization print the group that is being deoptimized.

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/cpu-profiler.h"
@@ skipping 2706 matching lines @@
     Object* head = entries->object_at(i);
     ClearDependentICList(head);
   }
   g = DependentCode::kWeakCodeGroup;
   for (int i = starts.at(g); i < starts.at(g + 1); i++) {
     // If the entry is compilation info then the map must be alive,
     // and ClearDependentCode shouldn't be called.
     DCHECK(entries->is_code_at(i));
     Code* code = entries->code_at(i);
     if (IsMarked(code) && !code->marked_for_deoptimization()) {
-      code->set_marked_for_deoptimization(true);
+      DependentCode::SetMarkedForDeoptimization(
+          code, static_cast<DependentCode::DependencyGroup>(g));
       code->InvalidateEmbeddedObjects();
       have_code_to_deoptimize_ = true;
     }
   }
   for (int i = 0; i < number_of_entries; i++) {
     entries->clear_at(i);
   }
 }
 
 
@@ skipping 2039 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }
 }  // namespace v8::internal