Generate some intrinsics using our IR.

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 670 matching lines @@
   void SubImmediate(Register reg, const Immediate& imm, Register pp);
   void SubImmediate(const Address& address, const Immediate& imm, Register pp);
 
   void Drop(intptr_t stack_elements);
 
   enum Patchability {
     kPatchable,
     kNotPatchable,
   };
 
+  bool allow_constant_pool() const {
+    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 LoadImmediate(const Address& dst, const Immediate& imm, Register pp);
   void LoadObject(Register dst, const Object& obj, 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);
   void StoreObject(const Address& dst, const Object& obj, Register pp);
@@ skipping 275 matching lines @@
     const String& comment() const { return comment_; }
 
    private:
     intptr_t pc_offset_;
     const String& comment_;
 
     DISALLOW_COPY_AND_ASSIGN(CodeComment);
   };
 
   GrowableArray<CodeComment*> comments_;
+  bool allow_constant_pool_;
 
   intptr_t FindObject(const Object& obj, Patchability patchable);
   intptr_t FindExternalLabel(const ExternalLabel* label,
                              Patchability patchable);
   intptr_t FindImmediate(int64_t imm);
   void LoadExternalLabel(Register dst,
                          const ExternalLabel* label,
                          Patchability patchable,
                          Register pp);
   bool CanLoadFromObjectPool(const Object& object);
@@ skipping 118 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_