Support untagged object pool entries.

runtime/vm/raw_object.cc

Index: runtime/vm/raw_object.cc
diff --git a/runtime/vm/raw_object.cc b/runtime/vm/raw_object.cc
index 04378e71a9bef9fdda6a42bda2119b5fb7c44436..31545928ce9ed1b961b61bad662fd643d3222e21 100644
--- a/runtime/vm/raw_object.cc
+++ b/runtime/vm/raw_object.cc
@@ -4,6 +4,7 @@
 
 #include "vm/raw_object.h"
 
+#include "vm/assembler.h"
 #include "vm/class_table.h"
 #include "vm/dart.h"
 #include "vm/freelist.h"
@@ -115,6 +116,13 @@ intptr_t RawObject::SizeFromClass() const {
       instance_size = Array::InstanceSize(array_length);
       break;
     }
+    case kObjectPoolCid: {
+      const RawObjectPool* raw_object_pool =
+          reinterpret_cast<const RawObjectPool*>(this);
+      intptr_t len = raw_object_pool->ptr()->length_;
+      instance_size = ObjectPool::InstanceSize(len);
+      break;
+    }
 #define SIZE_FROM_CLASS(clazz)                                                 \
     case kTypedData##clazz##Cid:
     CLASS_LIST_TYPED_DATA(SIZE_FROM_CLASS) {
@@ -523,6 +531,28 @@ intptr_t RawCode::VisitCodePointers(RawCode* raw_obj,
 }
 
 
+RawObjectPool::Entry* RawObjectPool::from() {
+  return &ptr()->data()[Assembler::kNumFixedEntries];
+}
+
+
+RawObjectPool::Entry* RawObjectPool::to() {
+  return &ptr()->data()[Assembler::kNumFixedEntries +
+                        ptr()->num_tagged_entries_ - 1];
+}
+
+
+intptr_t RawObjectPool::VisitObjectPoolPointers(
+    RawObjectPool* raw_obj, ObjectPointerVisitor* visitor) {
+  for (Entry* current = raw_obj->from();
+       current <= raw_obj->to();
+       current++) {
+    visitor->VisitPointer(&current->raw_obj_);
+  }
+  return ObjectPool::InstanceSize(raw_obj->ptr()->length_);
+}
+
+
 intptr_t RawInstructions::VisitInstructionsPointers(
     RawInstructions* raw_obj, ObjectPointerVisitor* visitor) {
   RawInstructions* obj = raw_obj->ptr();