Add insert/extract element to the integrated ARM assembler.

src/IceInstARM32.h

Index: src/IceInstARM32.h
diff --git a/src/IceInstARM32.h b/src/IceInstARM32.h
index 4d8f02b5b712e21d1f6ddf0a88f6cce172cfe286..bb685bc309d32894d1492f150a4e11932ffe38cf 100644
--- a/src/IceInstARM32.h
+++ b/src/IceInstARM32.h
@@ -1368,6 +1368,7 @@ public:
         InstARM32Extract(Func, Dest, Src0, Index, Predicate);
   }
   void emit(const Cfg *Func) const override;
+  void emitIAS(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Extract); }
 
 private:
@@ -1396,6 +1397,7 @@ public:
         InstARM32Insert(Func, Dest, Src0, Index, Predicate);
   }
   void emit(const Cfg *Func) const override;
+  void emitIAS(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Insert); }
 
 private: