Subzero: Initial O2 lowering

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index 5f3bfd3fc67b90da0411af9267e3334b0da695de..f452c78a67e67ed6c23cfaf1e18bf150be602e07 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -72,6 +72,7 @@ public:
 
   // Miscellaneous accessors.
   TargetLowering *getTarget() const { return Target.get(); }
+  Liveness *getLiveness() const { return Live.get(); }
   bool hasComputedFrame() const;
 
   // Passes over the CFG.
@@ -80,11 +81,15 @@ public:
   // compute the predecessor edges, in the form of
   // CfgNode::InEdges[].
   void computePredecessors();
+  void renumberInstructions();
   void placePhiLoads();
   void placePhiStores();
   void deletePhis();
+  void doAddressOpt();
   void genCode();
   void genFrame();
+  void liveness(LivenessMode Mode);
+  bool validateLiveness() const;
 
   // Manage the CurrentNode field, which is used for validating the
   // Variable::DefNode field during dumping/emitting.
@@ -139,6 +144,7 @@ private:
   int32_t NextInstNumber;
   VarList Variables;
   VarList Args; // subset of Variables, in argument order
+  llvm::OwningPtr<Liveness> Live;
   llvm::OwningPtr<TargetLowering> Target;
 
   // CurrentNode is maintained during dumping/emitting just for