Load the native call wrapper via Thread.

runtime/vm/assembler.cc

Index: runtime/vm/assembler.cc
diff --git a/runtime/vm/assembler.cc b/runtime/vm/assembler.cc
index 25803ca829ac7133ac794ee0bcafb20a9f97c760..4e1eca9571f9bfabe28f598a098c2f6c30b4eece 100644
--- a/runtime/vm/assembler.cc
+++ b/runtime/vm/assembler.cc
@@ -265,14 +265,6 @@ intptr_t ObjectPoolWrapper::AddObject(ObjectPool::Entry entry,
 }
 
 
-intptr_t ObjectPoolWrapper::AddExternalLabel(const ExternalLabel* label,
-                                             Patchability patchable) {
-  return AddObject(ObjectPool::Entry(label->address(),
-                                     ObjectPool::kExternalLabel),
-                   patchable);
-}
-
-
 intptr_t ObjectPoolWrapper::FindObject(ObjectPool::Entry entry,
                                        Patchability patchable) {
   // If the object is not patchable, check if we've already got it in the
@@ -300,14 +292,6 @@ intptr_t ObjectPoolWrapper::FindImmediate(uword imm) {
 }
 
 
-intptr_t ObjectPoolWrapper::FindExternalLabel(const ExternalLabel* label,
-                                              Patchability patchable) {
-  return FindObject(ObjectPool::Entry(label->address(),
-                                      ObjectPool::kExternalLabel),
-                    patchable);
-}
-
-
 intptr_t ObjectPoolWrapper::FindNativeEntry(const ExternalLabel* label,
                                             Patchability patchable) {
   return FindObject(ObjectPool::Entry(label->address(),