shader: resolve bounded GPU material keys through sampled image arrays

Co-authored-by: TheCruZ <thecruzwtf@gmail.com>

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

@@ -487,6 +487,7 @@ struct DescriptorSource {
 		uint32_t selector_stride = 0;
 		uint32_t selector_offset = 0;
 		uint32_t table_offset    = 0;
+		uint32_t selector_shift  = 0;
 		Value    key_count;
 		Value                 selector_first;
 		Value    selector_mask;