Subzero: Add the "llvm2ice -ffunction-sections" argument.

src/IceClFlags.h

 //===- subzero/src/IceClFlags.h - Cl Flags for translation ------*- 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 command line flags controlling translation.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECLFLAGS_H
 #define SUBZERO_SRC_ICECLFLAGS_H
 
 namespace Ice {
 
 class ClFlags {
 public:
   ClFlags()
       : DisableInternal(false), SubzeroTimingEnabled(false),
-        DisableTranslation(false), DisableGlobals(false) {}
+        DisableTranslation(false), DisableGlobals(false),
+        FunctionSections(false) {}
   bool DisableInternal;
   bool SubzeroTimingEnabled;
   bool DisableTranslation;
   bool DisableGlobals;
+  bool FunctionSections;
 };
-}
+
+} // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECLFLAGS_H