fix doxygen brief in subzero header files

src/IceCfg.cpp

 //===- subzero/src/IceCfg.cpp - Control flow graph implementation ---------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file implements the Cfg class, including constant pool management.
+/// \brief Implements the Cfg class, including constant pool management.

[Jim Stichnoth, 2015/12/01 18:41:16]

I don't think Cfg has anything to do with constant pool management.  I wonder if
that was a copy&paste mistake.  Just remove that clause?

[rkotlerimgtec, 2015/12/02 01:32:48]

Done.

 ///
 //===----------------------------------------------------------------------===//
 
 #include "IceCfg.h"
 
 #include "IceAssembler.h"
 #include "IceCfgNode.h"
 #include "IceClFlags.h"
 #include "IceDefs.h"
 #include "IceELFObjectWriter.h"
@@ skipping 1074 matching lines @@
     }
   }
   // Print each basic block
   for (CfgNode *Node : Nodes)
     Node->dump(this);
   if (isVerbose(IceV_Instructions))
     Str << "}\n";
 }
 
 } // end of namespace Ice