For background compilation we copy ICData so that it is immutable during comnpilation. However, we …

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index df2902c53a5755af9e1c4a80222f1569db585e78..ee5450dee67887523d97ce065f842a60737838c2 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -1402,10 +1402,10 @@ class RawICData : public RawObject {
   RawObject** from() {
     return reinterpret_cast<RawObject**>(&ptr()->owner_);
   }
-  RawFunction* owner_;         // Parent/calling function of this IC.
-  RawString* target_name_;     // Name of target function.
+  RawObject* owner_;  // Parent/calling function or original IC of cloned IC.
+  RawString* target_name_;  // Name of target function.
   RawArray* args_descriptor_;  // Arguments descriptor.
-  RawArray* ic_data_;          // Contains class-ids, target and count.
+  RawArray* ic_data_;  // Contains class-ids, target and count.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->ic_data_);
   }