Invoke CallToRuntime via Thread instead of ObjectPools.

runtime/vm/assembler_x64.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_X64_H_
 #define VM_ASSEMBLER_X64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_x64.h directly; use assembler.h instead.
 #endif
@@ skipping 755 matching lines @@
                        const ExternalLabel* label,
                        Patchability patchable);
   void LoadFunctionFromCalleePool(Register dst,
                                   const Function& function,
                                   Register new_pp);
   void JmpPatchable(const StubEntry& stub_entry, Register pp);
   void Jmp(const StubEntry& stub_entry, Register pp = PP);
   void J(Condition condition, const StubEntry& stub_entry, Register pp);
   void CallPatchable(const StubEntry& stub_entry);
   void Call(const StubEntry& stub_entry);
+  void CallToRuntime();
   // Emit a call that shares its object pool entries with other calls
   // that have the same equivalence marker.
   void CallWithEquivalence(const StubEntry& stub_entry,
                            const Object& equivalence);
   // Unaware of write barrier (use StoreInto* methods for storing to objects).
   // TODO(koda): Add StackAddress/HeapAddress types to prevent misuse.
   void StoreObject(const Address& dst, const Object& obj);
   void PushObject(const Object& object);
   void CompareObject(Register reg, const Object& object);
 
@@ skipping 418 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_