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

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 930609073a0655c3770d1b4f1c5116db3937ddc2..d00941675789dbee0d2b7b132c5f051f34a741bd 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -6006,6 +6006,9 @@ class DependentCode: public FixedArray {
   static DependentCode* ForObject(Handle<HeapObject> object,
                                   DependencyGroup group);
 
+  static const char* DependencyGroupName(DependencyGroup group);
+  static void SetMarkedForDeoptimization(Code* code, DependencyGroup group);
+
  private:
   // Make a room at the end of the given group by moving out the first
   // code objects of the subsequent groups.