shader_ir: Add internal flag getters

src/video_core/shader/shader_ir.cpp

@@ -109,6 +109,14 @@ Node ShaderIR::GetOutputAttribute(Attribute::Index index, u64 element, Node buff
     return StoreNode(AbufNode(index, static_cast<u32>(element), buffer));
 }
 
+Node ShaderIR::GetInternalFlag(InternalFlag flag, bool negated) {
+    const Node node = StoreNode(InternalFlagNode(flag));
+    if (negated) {
+        return Operation(OperationCode::LogicalNegate, node);
+    }
+    return node;
+}
+
 /*static*/ OperationCode ShaderIR::SignedToUnsignedCode(OperationCode operation_code,
                                                         bool is_signed) {
     if (is_signed) {

src/video_core/shader/shader_ir.h

@@ -629,6 +629,8 @@ private:
                            const Tegra::Shader::IpaMode& input_mode, Node buffer = {});
     /// Generates a node representing an output atttribute. Keeps track of used attributes.
     Node GetOutputAttribute(Tegra::Shader::Attribute::Index index, u64 element, Node buffer);
+    /// Generates a node representing an internal flag
+    Node GetInternalFlag(InternalFlag flag, bool negated = false);
 
     template <typename... T>
     inline Node Operation(OperationCode code, const T*... operands) {