Initial Subzero WASM prototype.

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index f9682e08bb256a300159b9d8ab9e3c72af9954dd..abb6722fbdc13d684f7239a681bd4070eddd86fa 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -256,6 +256,13 @@ public:
     Allocator->Deallocate(Array);
   }
 
+  /// Update Phi labels with InEdges.
+  ///
+  /// The WASM translator cannot always determine the right incoming edge for a
+  /// value due to the CFG being built incrementally. The fixPhiNodes pass fills
+  /// in the correct information once everything is known.
+  void fixPhiNodes();
+
 private:
   friend class CfgAllocatorTraits; // for Allocator access.