Load the native call wrapper via Thread.

runtime/vm/assembler_arm64.cc

Index: runtime/vm/assembler_arm64.cc
diff --git a/runtime/vm/assembler_arm64.cc b/runtime/vm/assembler_arm64.cc
index 28bdfc071eb105a0eb16adc1e5ad2374e5fc5167..06203d20194d602684eff64b346e1833028de297 100644
--- a/runtime/vm/assembler_arm64.cc
+++ b/runtime/vm/assembler_arm64.cc
@@ -384,18 +384,6 @@ bool Assembler::CanLoadFromObjectPool(const Object& object) const {
 }
 
 
-void Assembler::LoadExternalLabel(Register dst, const ExternalLabel* label) {
-  if (constant_pool_allowed()) {
-    const int32_t offset = ObjectPool::element_offset(
-        object_pool_wrapper_.FindExternalLabel(label, kNotPatchable));
-    LoadWordFromPoolOffset(dst, offset);
-  } else {
-    const int64_t target = static_cast<int64_t>(label->address());
-    LoadImmediate(dst, target);
-  }
-}
-
-
 void Assembler::LoadNativeEntry(Register dst,
                                 const ExternalLabel* label) {
   const int32_t offset = ObjectPool::element_offset(
@@ -404,15 +392,6 @@ void Assembler::LoadNativeEntry(Register dst,
 }
 
 
-void Assembler::LoadExternalLabelFixed(Register dst,
-                                       const ExternalLabel* label,
-                                       Patchability patchable) {
-  const int32_t offset = ObjectPool::element_offset(
-      object_pool_wrapper_.FindExternalLabel(label, patchable));
-  LoadWordFromPoolOffsetFixed(dst, offset);
-}
-
-
 void Assembler::LoadIsolate(Register dst) {
   ldr(dst, Address(THR, Thread::isolate_offset()));
 }