Add "add immediate" 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 570 matching lines @@
                                        CondARM32::Cond Predicate,
                                        bool SetFlags = false) {
     return new (Func->allocate<InstARM32ThreeAddrGPR>())
         InstARM32ThreeAddrGPR(Func, Dest, Src0, Src1, Predicate, SetFlags);
   }
   void emit(const Cfg *Func) const override {
     if (!BuildDefs::dump())
       return;
     emitThreeAddr(Opcode, this, Func, SetFlags);
   }
-  void emitIAS(const Cfg *Func) const override {
-    (void)Func;
-    llvm::report_fatal_error("Not yet implemented");
-  }
+  void emitIAS(const Cfg *Func) const override;
   void dump(const Cfg *Func) const override {
     if (!BuildDefs::dump())
       return;
     Ostream &Str = Func->getContext()->getStrDump();
     dumpDest(Func);
     Str << " = ";
     dumpOpcodePred(Str, Opcode, getDest()->getType());
     Str << (SetFlags ? ".s " : " ");
     dumpSources(Func);
   }
@@ skipping 658 matching lines @@
 // 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