Load the native call wrapper via Thread.

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 768 matching lines @@
   if (!function().HasOptionalParameters()) {
     __ leaq(RAX, Address(RBP, (kParamEndSlotFromFp +
                                function().NumParameters()) * kWordSize));
   } else {
     __ leaq(RAX, Address(RBP, kFirstLocalSlotFromFp * kWordSize));
   }
   __ LoadImmediate(R10, Immediate(argc_tag));
   const StubEntry* stub_entry;
   if (link_lazily()) {
     stub_entry = StubCode::CallBootstrapCFunction_entry();
-    __ LoadNativeEntry(
-        RBX, &NativeEntry::LinkNativeCallLabel(), kPatchable);
+    ExternalLabel label(NativeEntry::LinkNativeCallEntry());
+    __ LoadNativeEntry(RBX, &label, kPatchable);
   } else {
     stub_entry = (is_bootstrap_native() || is_leaf_call)
         ? StubCode::CallBootstrapCFunction_entry()
         : StubCode::CallNativeCFunction_entry();
     const ExternalLabel label(reinterpret_cast<uword>(native_c_function()));
     __ LoadNativeEntry(RBX, &label, kNotPatchable);
   }
   compiler->GenerateCall(token_pos(),
                          *stub_entry,
                          RawPcDescriptors::kOther,
@@ skipping 5650 matching lines @@
   __ Drop(1);
   __ popq(result);
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64