Doxygenize the documentation comments

src/IceAssemblerX8632.cpp

 //===- subzero/src/IceAssemblerX8632.cpp - Assembler for x86-32  ----------===//
 // 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.
 //
 // Modified by the Subzero authors.
 //
 //===----------------------------------------------------------------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// This file implements the Assembler class for x86-32.
-//
+///
+/// \file
+/// This file implements the Assembler class for x86-32.
+///
 //===----------------------------------------------------------------------===//
 
 #include "IceAssemblerX8632.h"
 
 #include "IceCfg.h"
 #include "IceOperand.h"
 
 namespace Ice {
 namespace X8632 {
 
@@ skipping 2520 matching lines @@
   assert(shifter == RegX8632::Encoded_Reg_ecx);
   (void)shifter;
   if (Ty == IceType_i16)
     emitOperandSizeOverride();
   emitUint8(isByteSizedArithType(Ty) ? 0xD2 : 0xD3);
   emitOperand(rm, operand);
 }
 
 } // end of namespace X8632
 } // end of namespace Ice