Subzero: Improve the representation and handling of the FakeKill instruction.

src/IceInst.h

 //===- subzero/src/IceInst.h - High-level instructions ----------*- 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 the Inst class and its target-independent
@@ skipping 783 matching lines @@
 class InstFakeKill : public InstHighLevel {
   InstFakeKill(const InstFakeKill &) = delete;
   InstFakeKill &operator=(const InstFakeKill &) = delete;
 
 public:
   static InstFakeKill *create(Cfg *Func, const VarList &KilledRegs,
                               const Inst *Linked) {
     return new (Func->allocateInst<InstFakeKill>())
         InstFakeKill(Func, KilledRegs, Linked);
   }
+  const VarList &getKilledRegs() const { return KilledRegs; }
   const Inst *getLinked() const { return Linked; }
   void emit(const Cfg *Func) const override;
   void emitIAS(const Cfg * /* Func */) const override {}
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return Inst->getKind() == FakeKill; }
 
 private:
   InstFakeKill(Cfg *Func, const VarList &KilledRegs, const Inst *Linked);
   ~InstFakeKill() override {}
 
+  const VarList &KilledRegs;
   // This instruction is ignored if Linked->isDeleted() is true.
   const Inst *Linked;
 };
 
 // The Target instruction is the base class for all target-specific
 // instructions.
 class InstTarget : public Inst {
   InstTarget(const InstTarget &) = delete;
   InstTarget &operator=(const InstTarget &) = delete;
 
 public:
   uint32_t getEmitInstCount() const override { return 1; }
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return Inst->getKind() >= Target; }
 
 protected:
   InstTarget(Cfg *Func, InstKind Kind, SizeT MaxSrcs, Variable *Dest)
       : Inst(Func, Kind, MaxSrcs, Dest) {
     assert(Kind >= Target);
   }
   ~InstTarget() override {}
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINST_H