Simplify references to command line flags.

src/IceRegAlloc.cpp

 //===- subzero/src/IceRegAlloc.cpp - Linear-scan implementation -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 77 matching lines @@
   }
   assert(MinWeightIndex >= 0);
   return MinWeightIndex;
 }
 
 } // end of anonymous namespace
 
 LinearScan::LinearScan(Cfg *Func)
     : Func(Func), Ctx(Func->getContext()), Target(Func->getTarget()),
       Verbose(BuildDefs::dump() && Func->isVerbose(IceV_LinearScan)),
-      UseReserve(Ctx->getFlags().getRegAllocReserve()) {}
+      UseReserve(getFlags().getRegAllocReserve()) {}
 
 // Prepare for full register allocation of all variables. We depend on liveness
 // analysis to have calculated live ranges.
 void LinearScan::initForGlobal() {
   TimerMarker T(TimerStack::TT_initUnhandled, Func);
   FindPreference = true;
   // For full register allocation, normally we want to enable FindOverlap
   // (meaning we look for opportunities for two overlapping live ranges to
   // safely share the same register). However, we disable it for phi-lowering
   // register allocation since no overlap opportunities should be available and
@@ skipping 900 matching lines @@
     Str << "\n";
   }
   Str << "++++++ Inactive:\n";
   for (const Variable *Item : Inactive) {
     dumpLiveRange(Item, Func);
     Str << "\n";
   }
 }
 
 } // end of namespace Ice