Subzero: Minor refactoring/additions in preparation for phi edge splitting.

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 536 matching lines @@
 class InstPhi : public InstHighLevel {
   InstPhi(const InstPhi &) = delete;
   InstPhi &operator=(const InstPhi &) = delete;
 
 public:
   static InstPhi *create(Cfg *Func, SizeT MaxSrcs, Variable *Dest) {
     return new (Func->allocateInst<InstPhi>()) InstPhi(Func, MaxSrcs, Dest);
   }
   void addArgument(Operand *Source, CfgNode *Label);
   Operand *getOperandForTarget(CfgNode *Target) const;
+  CfgNode *getLabel(SizeT Index) const { return Labels[Index]; }
   void livenessPhiOperand(LivenessBV &Live, CfgNode *Target,
                           Liveness *Liveness);
   Inst *lower(Cfg *Func);
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return Inst->getKind() == Phi; }
 
 private:
   InstPhi(Cfg *Func, SizeT MaxSrcs, Variable *Dest);
   void destroy(Cfg *Func) override {
     Func->deallocateArrayOf<CfgNode *>(Labels);
@@ skipping 243 matching lines @@
   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