Support variadic arguments for OpPhi

include/sirit/sirit.h

@@ -256,6 +256,12 @@ public:
      */
     Id OpPhi(Id result_type, std::span<const Id> operands);
 
+    template <typename... Ts>
+    requires(...&& std::is_convertible_v<Ts, Id>) Id
+        OpPhi(Id result_type, Ts&&... operands) {
+        return OpPhi(result_type, std::span<const Id>({operands...}));
+    }
+    
     /**
      * The SSA phi function. This instruction will be revisited when patching phi nodes.
      *

src/stream.h

@@ -7,11 +7,11 @@
 #pragma once
 
 #include <bit>
-#include <span>
 #include <cassert>
 #include <concepts>
 #include <cstddef>
 #include <functional>
+#include <span>
 #include <string_view>
 #include <unordered_map>
 #include <variant>