Drive by fix: NewVarNode in forward mode

Author: Keno

src/stage1/recurse_fwd.jl

@@ -55,6 +55,8 @@ function transform_fwd!(ci, meth, nargs, sparams, N)
             return SlotNumber(2 + stmt.id)
         elseif isa(stmt, Argument)
             return SlotNumber(2 + stmt.n)
+        elseif isa(stmt, NewvarNode)
+            return NewvarNode(SlotNumber(2 + stmt.slot.id))
         elseif isa(stmt, ReturnNode)
             return ReturnNode(emit!(mapstmt!(stmt.val)))
         elseif isa(stmt, GotoNode)