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

src/IceCompiler.cpp

Index: src/IceCompiler.cpp
diff --git a/src/IceCompiler.cpp b/src/IceCompiler.cpp
index b4b6c89a758a06eb51f3d8beac8d932166f4eaa5..fdd97563ab5473349dbde4093b9dd59866d26ee4 100644
--- a/src/IceCompiler.cpp
+++ b/src/IceCompiler.cpp
@@ -181,7 +181,7 @@ void Compiler::run(const Ice::ClFlagsExtra &ExtraFlags, GlobalContext &Ctx,
     Ctx.dumpTimers();
 
   if (Ctx.getFlags().getTimeEachFunction()) {
-    const bool DumpCumulative = false;
+    constexpr bool DumpCumulative = false;
     Ctx.dumpTimers(GlobalContext::TSK_Funcs, DumpCumulative);
   }
   constexpr bool FinalStats = true;