Add Om1 lowering with no optimizations

src/IceCfgNode.h

 //===- subzero/src/IceCfgNode.h - Control flow graph node -------*- 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 CfgNode class, which represents a single
@@ skipping 11 matching lines @@
 
 class CfgNode {
 public:
   static CfgNode *create(Cfg *Func, SizeT LabelIndex, IceString Name = "") {
     return new (Func->allocate<CfgNode>()) CfgNode(Func, LabelIndex, Name);
   }
 
   // Access the label number and name for this node.
   SizeT getIndex() const { return Number; }
   IceString getName() const;
+  IceString getAsmName() const {
+    return ".L" + Func->getFunctionName() + "$" + getName();
+  }
+
+  // The HasReturn flag indicates that this node contains a return
+  // instruction and therefore needs an epilog.
+  void setHasReturn() { HasReturn = true; }
+  bool getHasReturn() const { return HasReturn; }
 
   // Access predecessor and successor edge lists.
   const NodeList &getInEdges() const { return InEdges; }
   const NodeList &getOutEdges() const { return OutEdges; }
 
   // Manage the instruction list.
   InstList &getInsts() { return Insts; }
   void appendInst(Inst *Inst);
 
   // Add a predecessor edge to the InEdges list for each of this
   // node's successors.
   void computePredecessors();
 
+  void placePhiLoads();
+  void placePhiStores();
+  void deletePhis();
+  void genCode();
+  void emit(Cfg *Func) const;
   void dump(Cfg *Func) const;
 
 private:
   CfgNode(Cfg *Func, SizeT LabelIndex, IceString Name);
   CfgNode(const CfgNode &) LLVM_DELETED_FUNCTION;
   CfgNode &operator=(const CfgNode &) LLVM_DELETED_FUNCTION;
   Cfg *const Func;
   const SizeT Number; // label index
   IceString Name;     // for dumping only
+  bool HasReturn;     // does this block need an epilog?
   NodeList InEdges;   // in no particular order
   NodeList OutEdges;  // in no particular order
   PhiList Phis;       // unordered set of phi instructions
   InstList Insts;     // ordered list of non-phi instructions
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFGNODE_H