shader/shader_ir: Simplify constructors for OperationNode

Many of these constructors don't even need to be templated. The only
ones that need to be templated are the ones that actually make use of
the parameter pack.

Even then, since std::vector accepts an initializer list, we can supply
the parameter pack directly to it instead of creating our own copy of
the list, then copying it again into the std::vector.

src/video_core/shader/shader_ir.h

@@ -336,32 +336,23 @@ using Meta = std::variant<MetaArithmetic, MetaTexture, Tegra::Shader::HalfType>;
 /// Holds any kind of operation that can be done in the IR
 class OperationNode final {
 public:
-    template <typename... T>
-    explicit constexpr OperationNode(OperationCode code) : code{code}, meta{} {}
+    explicit OperationNode(OperationCode code) : code{code} {}
 
-    template <typename... T>
-    explicit constexpr OperationNode(OperationCode code, Meta&& meta)
-        : code{code}, meta{std::move(meta)} {}
+    explicit OperationNode(OperationCode code, Meta&& meta) : code{code}, meta{std::move(meta)} {}
 
     template <typename... T>
-    explicit constexpr OperationNode(OperationCode code, const T*... operands)
+    explicit OperationNode(OperationCode code, const T*... operands)
         : OperationNode(code, {}, operands...) {}
 
     template <typename... T>
-    explicit constexpr OperationNode(OperationCode code, Meta&& meta, const T*... operands_)
-        : code{code}, meta{std::move(meta)} {
-
-        auto operands_list = {operands_...};
-        for (auto& operand : operands_list) {
-            operands.push_back(operand);
-        }
-    }
+    explicit OperationNode(OperationCode code, Meta&& meta, const T*... operands_)
+        : code{code}, meta{std::move(meta)}, operands{operands_...} {}
 
     explicit OperationNode(OperationCode code, Meta&& meta, std::vector<Node>&& operands)
         : code{code}, meta{meta}, operands{std::move(operands)} {}
 
     explicit OperationNode(OperationCode code, std::vector<Node>&& operands)
-        : code{code}, meta{}, operands{std::move(operands)} {}
+        : code{code}, operands{std::move(operands)} {}
 
     OperationCode GetCode() const {
         return code;