Initial Subzero WASM prototype.

src/IceCfgNode.h

Index: src/IceCfgNode.h
diff --git a/src/IceCfgNode.h b/src/IceCfgNode.h
index f0633dfd1798d40a9e0ea69635a3f58753450a90..cf3e83c987c674d6ad7c199061d291072dfc4b3b 100644
--- a/src/IceCfgNode.h
+++ b/src/IceCfgNode.h
@@ -72,7 +72,7 @@ public:
   /// @{
   InstList &getInsts() { return Insts; }
   PhiList &getPhis() { return Phis; }
-  void appendInst(Inst *Instr);
+  void appendInst(Inst *Instr, bool AllowPhisAnywhere = false);
   void renumberInstructions();
   /// Rough and generally conservative estimate of the number of instructions in
   /// the block. It is updated when an instruction is added, but not when
@@ -110,6 +110,13 @@ public:
 
   void profileExecutionCount(VariableDeclaration *Var);
 
+  void addOutEdge(CfgNode *Out) { OutEdges.push_back(Out); }
+  void addInEdge(CfgNode *In) { InEdges.push_back(In); }
+
+  bool hasSingleOutEdge() const {
+    return (getOutEdges().size() == 1 || getOutEdges()[0] == getOutEdges()[1]);
+  }
+
 private:
   CfgNode(Cfg *Func, SizeT Number);
   bool livenessValidateIntervals(Liveness *Liveness) const;