shader: resolve masked image keys in strided descriptor records

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

@@ -493,6 +493,7 @@ struct DescriptorSource {
 		uint32_t table_stride    = 0;
 		uint32_t workgroup_axis  = UINT32_MAX;
 		uint32_t selector_shift  = 0;
+		uint32_t selector_bits   = UINT32_MAX;
 		Value    key_count;
 		Value                 selector_first;
 		Value    selector_mask;