shader: bind dispatch spans while keeping GPU record counts native

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

src/graphics/shader/recompiler/ir/passes/ResourceMaterialization.h

@@ -43,6 +43,10 @@ struct ResourceSpecialization {
 // its values and is independent of the translated shader CFG.
 ResourcePlan ExtractResourcePlan(const Program& program);
 
+// Nonnegative constant/local/workgroup coefficients under the instruction's active guard.
+std::optional<std::array<uint64_t, 3>> AffineIndex(Value value, uint32_t axis, Value guard,
+                                                 uint32_t depth = 0);
+
 // Refreshes cached resources and specialization in place. A failed refresh must not be used.
 bool MaterializeResources(const ResourcePlan& program, const SrtRuntime& runtime,
                           ResourceSnapshot& snapshot, ResourceSpecialization& specialization);