Enable allocation tracing for classes owned by vm isolate

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 8d3ef5ed66909c3decd135ee913e2f07ba3a321c..16dc598dcf635dda3fa89c10c4abc43203bac128 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -1366,9 +1366,7 @@ class Class : public Object {
   RawArray* cha_codes() const { return raw_ptr()->cha_codes_; }
   void set_cha_codes(const Array& value) const;
 
-  bool trace_allocation() const {
-    return TraceAllocationBit::decode(raw_ptr()->state_bits_);
-  }
+  bool TraceAllocation(Isolate* isolate) const;
   void SetTraceAllocation(bool trace_allocation) const;
 
  private:
@@ -1394,7 +1392,6 @@ class Class : public Object {
     kFieldsMarkedNullableBit = 11,
     kCycleFreeBit = 12,
     kEnumBit = 13,
-    kTraceAllocationBit = 14,
     kIsAllocatedBit = 15,
   };
   class ConstBit : public BitField<bool, kConstBit, 1> {};
@@ -1412,7 +1409,6 @@ class Class : public Object {
       kFieldsMarkedNullableBit, 1> {};  // NOLINT
   class CycleFreeBit : public BitField<bool, kCycleFreeBit, 1> {};
   class EnumBit : public BitField<bool, kEnumBit, 1> {};
-  class TraceAllocationBit : public BitField<bool, kTraceAllocationBit, 1> {};
   class IsAllocatedBit : public BitField<bool, kIsAllocatedBit, 1> {};
 
   void set_name(const String& value) const;