libobs-d3d11: Add optional macro to log shader disassembly

libobs-d3d11/d3d11-subsystem.hpp

@@ -37,6 +37,8 @@
 #include <util/windows/ComPtr.hpp>
 #include <util/windows/HRError.hpp>
 
+// #define DISASSEMBLE_SHADERS
+
 struct shader_var;
 struct shader_sampler;
 struct gs_vertex_shader;
@@ -801,6 +803,9 @@ struct gs_device {
 	D3D11_PRIMITIVE_TOPOLOGY    curToplogy;
 
 	pD3DCompile                 d3dCompile = nullptr;
+#ifdef DISASSEMBLE_SHADERS
+	pD3DDisassemble             d3dDisassemble = nullptr;
+#endif
 
 	gs_rect                     viewport;