Use EmbedderHeapTracer instead of object grouping when trace_embedder_heap flag is set

src/fast-accessor-assembler.cc

Index: src/fast-accessor-assembler.cc
diff --git a/src/fast-accessor-assembler.cc b/src/fast-accessor-assembler.cc
index cd2910ca132214374d7bc857099bdcb36370db0e..1bbb1504d3dae1b949089508045c399485cce959 100644
--- a/src/fast-accessor-assembler.cc
+++ b/src/fast-accessor-assembler.cc
@@ -56,12 +56,13 @@ FastAccessorAssembler::ValueId FastAccessorAssembler::LoadInternalField(
   CodeStubAssembler::Variable result(assembler_.get(),
                                      MachineRepresentation::kTagged);
   CodeStubAssembler::Label is_jsobject(assembler_.get());
+  CodeStubAssembler::Label maybe_api_object(assembler_.get());
   CodeStubAssembler::Label is_not_jsobject(assembler_.get());
   CodeStubAssembler::Label merge(assembler_.get(), &result);
   assembler_->Branch(
       assembler_->WordEqual(
           instance_type, assembler_->IntPtrConstant(Internals::kJSObjectType)),
-      &is_jsobject, &is_not_jsobject);
+      &is_jsobject, &maybe_api_object);
 
   // JSObject? Then load the internal field field_no.
   assembler_->Bind(&is_jsobject);
@@ -71,6 +72,12 @@ FastAccessorAssembler::ValueId FastAccessorAssembler::LoadInternalField(
   result.Bind(internal_field);
   assembler_->Goto(&merge);
 
+  assembler_->Bind(&maybe_api_object);
+  assembler_->Branch(
+      assembler_->WordEqual(instance_type, assembler_->IntPtrConstant(
+                                               Internals::kJSApiObjectType)),
+      &is_jsobject, &is_not_jsobject);
+
   // No JSObject? Return undefined.
   // TODO(vogelheim): Check whether this is the appropriate action, or whether
   //                  the method should take a label instead.