Subzero: Refactor x86 register definitions to use the alias mechanism.

src/IceCompiler.cpp

 //===- subzero/src/IceCompiler.cpp - Driver for bitcode translation -------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 163 matching lines @@
       TimerMarker T1(Ice::TimerStack::TT_emit, &Ctx);
       Ctx.getObjectWriter()->setUndefinedSyms(Ctx.getConstantExternSyms());
       Ctx.getObjectWriter()->writeNonUserSections();
     }
   }
 
   if (Ctx.getFlags().getSubzeroTimingEnabled())
     Ctx.dumpTimers();
 
   if (Ctx.getFlags().getTimeEachFunction()) {
-    const bool DumpCumulative = false;
+    constexpr bool DumpCumulative = false;
     Ctx.dumpTimers(GlobalContext::TSK_Funcs, DumpCumulative);
   }
   constexpr bool FinalStats = true;
   Ctx.dumpStats("_FINAL_", FinalStats);
 }
 
 } // end of namespace Ice