Subzero: Merge SpillVariable functionality directly into Variable.

src/IceTargetLoweringX86Base.h

 //===- subzero/src/IceTargetLoweringX86Base.h - x86 lowering ----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 52 matching lines @@
   using ConcreteTarget = typename Traits::ConcreteTarget;
   using InstructionSetEnum = typename Traits::InstructionSet;
 
   using BrCond = typename Traits::Cond::BrCond;
   using CmppsCond = typename Traits::Cond::CmppsCond;
 
   using X86Address = typename Traits::Address;
   using X86Operand = typename Traits::X86Operand;
   using X86OperandMem = typename Traits::X86OperandMem;
   using SegmentRegisters = typename Traits::X86OperandMem::SegmentRegisters;
-  using SpillVariable = typename Traits::SpillVariable;
 
   using InstX86Br = typename Traits::Insts::Br;
   using InstX86FakeRMW = typename Traits::Insts::FakeRMW;
   using InstX86Label = typename Traits::Insts::Label;
 
   ~TargetX86Base() override = default;
 
   static void staticInit(GlobalContext *Ctx);
   static bool shouldBePooled(const Constant *C);
 
@@ skipping 1085 matching lines @@
 
   explicit TargetHeaderX86(GlobalContext *Ctx) : TargetHeaderLowering(Ctx) {}
 };
 
 } // end of namespace X86NAMESPACE
 } // end of namespace Ice
 
 #include "IceTargetLoweringX86BaseImpl.h"
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX86BASE_H