Doxygenize the documentation comments

src/IceFixups.h

 //===- subzero/src/IceFixups.h - Assembler fixup kinds ----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// This file declares generic fixup types.
-//
+///
+/// \file
+/// This file declares generic fixup types.
+///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEFIXUPS_H
 #define SUBZERO_SRC_ICEFIXUPS_H
 
 #include "IceDefs.h"
 
 namespace Ice {
 
-// Each target and container format has a different namespace of relocations.
-// This holds the specific target+container format's relocation number.
+/// Each target and container format has a different namespace of relocations.
+/// This holds the specific target+container format's relocation number.
 typedef uint32_t FixupKind;
 
-// Assembler fixups are positions in generated code/data that hold relocation
-// information that needs to be processed before finalizing the code/data.
+/// Assembler fixups are positions in generated code/data that hold relocation
+/// information that needs to be processed before finalizing the code/data.
 struct AssemblerFixup {
   AssemblerFixup &operator=(const AssemblerFixup &) = delete;
 
 public:
   AssemblerFixup() = default;
   AssemblerFixup(const AssemblerFixup &) = default;
   intptr_t position() const { return position_; }
   void set_position(intptr_t Position) { position_ = Position; }
 
   FixupKind kind() const { return kind_; }
@@ skipping 14 matching lines @@
   FixupKind kind_ = 0;
   const Constant *value_ = nullptr;
 };
 
 typedef std::vector<AssemblerFixup> FixupList;
 typedef std::vector<AssemblerFixup *> FixupRefList;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEFIXUPS_H