Initial Subzero WASM prototype.

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index f6f330909e064a7c6837871fbd0c0d2b624bca27..e9f2351d62a3069059823909693d67722d2673bd 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -254,6 +254,13 @@ public:
     Allocator->Deallocate(Array);
   }
 
+  /// Update Phi labels with InEdges.
+  ///
+  /// The WASM translator cannot always determine the right incoming edge for a
+  /// value. The fixPhiNodes pass fills in the correct information once
+  /// everything is known.
+  void fixPhiNodes();
+
 private:
   friend class CfgAllocatorTraits; // for Allocator access.