Object pool with support for untagged entries.

runtime/vm/assembler_mips.cc

Index: runtime/vm/assembler_mips.cc
diff --git a/runtime/vm/assembler_mips.cc b/runtime/vm/assembler_mips.cc
index ef1857c71d20c77a13a0745ec69f92db92edcece..832cc8b3be3a085d4406608a3d9b51b6a9bde47c 100644
--- a/runtime/vm/assembler_mips.cc
+++ b/runtime/vm/assembler_mips.cc
@@ -472,7 +472,7 @@ void Assembler::LoadObject(Register rd, const Object& object) {
     // Make sure that class CallPattern is able to decode this load from the
     // object pool.
     const int32_t offset =
-        Array::element_offset(object_pool_.FindObject(object, kNotPatchable));
+        ObjectPool::element_offset(object_pool_wrapper_.FindObject(object));
     LoadWordFromPoolOffset(rd, offset - kHeapObjectTag);
   }
 }