graphics: fix PS5 NGG vertex and instance draw offsets

Refs: https://github.com/KytyPS5/KytyPS5/issues/130

src/graphics/shader/recompiler/ir/ShaderIR.h

@@ -418,6 +418,7 @@ struct ShaderInfo {
 	std::vector<StageOutput>         outputs;
 	std::array<uint8_t, 32>          vertex_fetch_components {};
 	int32_t                          vertex_offset_sgpr = -1;
+	int32_t                          instance_offset_sgpr = -1;
 	bool                             has_bitwise_xor    = false;
 	bool                             uses_dma           = false;