Use object pool for runtime calls.

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 744 matching lines @@
     return allow_constant_pool_;
   }
   void set_allow_constant_pool(bool b) {
     allow_constant_pool_ = b;
   }
 
   bool CanLoadImmediateFromPool(const Immediate& imm, Register pp);
   void LoadImmediate(Register reg, const Immediate& imm, Register pp);
   void LoadIsolate(Register dst);
   void LoadObject(Register dst, const Object& obj, Register pp);
+  void LoadExternalLabel(Register dst,
+                         const ExternalLabel* label,
+                         Patchability patchable,
+                         Register pp);
   void JmpPatchable(const ExternalLabel* label, Register pp);
   void Jmp(const ExternalLabel* label, Register pp);
   void J(Condition condition, const ExternalLabel* label, Register pp);
   void CallPatchable(const ExternalLabel* label);
   void Call(const ExternalLabel* label, Register pp);
   // 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, Register pp);
   void PushObject(const Object& object, Register pp);
   void CompareObject(Register reg, const Object& object, Register pp);
@@ skipping 180 matching lines @@
   //   ....       <=== RSP
   //   pc (used to derive the RawInstruction Object of the stub)
   //   saved RBP  <=== RBP
   //   ret PC
   //   .....
   // This code sets this up with the sequence:
   //   pushq rbp
   //   movq rbp, rsp
   //   pushq immediate(0)
   //   .....
-  void EnterStubFrame(bool load_pp = false);
+  void EnterStubFrame();
   void LeaveStubFrame();
 
   // Instruction pattern from entrypoint is used in dart frame prologues
   // to set up the frame and save a PC which can be used to figure out the
   // RawInstruction object corresponding to the code running in the frame.
   // entrypoint:
   //   pushq rbp          (size is 1 byte)
   //   movq rbp, rsp      (size is 3 bytes)
   //   call L             (size is 5 bytes)
   //   L:
@@ skipping 78 matching lines @@
     intptr_t pc_offset_;
     const String& comment_;
 
     DISALLOW_COPY_AND_ASSIGN(CodeComment);
   };
 
   GrowableArray<CodeComment*> comments_;
   bool allow_constant_pool_;
 
   intptr_t FindImmediate(int64_t imm);
-  void LoadExternalLabel(Register dst,
-                         const ExternalLabel* label,
-                         Patchability patchable,
-                         Register pp);
   bool CanLoadFromObjectPool(const Object& object);
   void LoadWordFromPoolOffset(Register dst, Register pp, int32_t offset);
 
   inline void EmitUint8(uint8_t value);
   inline void EmitInt32(int32_t value);
   inline void EmitInt64(int64_t value);
 
   inline void EmitRegisterREX(Register reg, uint8_t rex);
   inline void EmitOperandREX(int rm, const Operand& operand, uint8_t rex);
   inline void EmitXmmRegisterOperand(int rm, XmmRegister reg);
@@ skipping 121 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_