shader: read image descriptors indexed by workgroup

Co-authored-by: Çağatay Güçlü <33038942+defektu@users.noreply.github.com>

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

@@ -488,6 +488,8 @@ struct DescriptorSource {
 		uint32_t selector_stride = 0;
 		uint32_t selector_offset = 0;
 		uint32_t table_offset    = 0;
+		uint32_t table_stride    = 0;
+		uint32_t workgroup_axis  = UINT32_MAX;
 		uint32_t selector_shift  = 0;
 		Value    key_count;
 		Value                 selector_first;