Add DMB instruction to the ARM integrated assembler.

src/IceInstARM32.h

 //===- subzero/src/IceInstARM32.h - ARM32 machine instructions --*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 1342 matching lines @@
 class InstARM32Dmb final : public InstARM32Pred {
   InstARM32Dmb() = delete;
   InstARM32Dmb(const InstARM32Dmb &) = delete;
   InstARM32Dmb &operator=(const InstARM32Dmb &) = delete;
 
 public:
   static InstARM32Dmb *create(Cfg *Func) {
     return new (Func->allocate<InstARM32Dmb>()) InstARM32Dmb(Func);
   }
   void emit(const Cfg *Func) const override;
+  void emitIAS(const Cfg *Func) const override;
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Dmb); }
 
 private:
   explicit InstARM32Dmb(Cfg *Func);
 };
 
 // Declare partial template specializations of emit() methods that already have
 // default implementations. Without this, there is the possibility of ODR
 // violations and link errors.
 
 template <> void InstARM32Ldr::emit(const Cfg *Func) const;
 template <> void InstARM32Movw::emit(const Cfg *Func) const;
 template <> void InstARM32Movt::emit(const Cfg *Func) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTARM32_H