Load the native call wrapper via Thread.

runtime/vm/assembler_mips.h

 // 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.
 
 #ifndef VM_ASSEMBLER_MIPS_H_
 #define VM_ASSEMBLER_MIPS_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_mips.h directly; use assembler.h instead.
 #endif
@@ skipping 887 matching lines @@
   // None of rd, rs, rt, or ro may be TMP.
   void SubImmediateDetectOverflow(Register rd, Register rs, int32_t imm,
                                   Register ro) {
     ASSERT(!in_delay_slot_);
     LoadImmediate(rd, imm);
     SubuDetectOverflow(rd, rs, rd, ro);
   }
 
   void Branch(const StubEntry& stub_entry, Register pp = PP);
 
-  void BranchLink(const ExternalLabel* label, Patchability patchable);
-
   void BranchLink(const StubEntry& stub_entry,
                   Patchability patchable = kNotPatchable);
 
   void BranchLinkPatchable(const StubEntry& stub_entry);
 
   void Drop(intptr_t stack_elements) {
     ASSERT(stack_elements >= 0);
     if (stack_elements > 0) {
       addiu(SP, SP, Immediate(stack_elements * kWordSize));
     }
@@ skipping 585 matching lines @@
   void ReserveAlignedFrameSpace(intptr_t frame_space);
 
   // Create a frame for calling into runtime that preserves all volatile
   // registers.  Frame's SP is guaranteed to be correctly aligned and
   // frame_space bytes are reserved under it.
   void EnterCallRuntimeFrame(intptr_t frame_space);
   void LeaveCallRuntimeFrame();
 
   void LoadObject(Register rd, const Object& object);
   void LoadUniqueObject(Register rd, const Object& object);
-  void LoadExternalLabel(Register rd,
-                         const ExternalLabel* label,
-                         Patchability patchable);
   void LoadFunctionFromCalleePool(Register dst,
                                   const Function& function,
                                   Register new_pp);
   void LoadNativeEntry(Register rd,
                        const ExternalLabel* label,
                        Patchability patchable);
   void PushObject(const Object& object);
 
   void LoadIsolate(Register result);
 
@@ skipping 209 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_MIPS_H_