Implement RDNA2 per-invocation scratch memory

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

@@ -679,11 +679,10 @@ bool MaterializeResources(const Program& program, const SrtRuntime& runtime,
 		} else {
 			if (!runtime.flat_memory_base.has_value()) {
 				if (error != nullptr) {
-					*error =
-					    fmt::format("unbased {} address at pc 0x{:08x} requires runtime "
-					                "guest-address translation",
-					                address.kind == ResourceKind::Flat ? "FLAT" : "global/scratch",
-					                address.first_use_pc);
+					*error = fmt::format("unbased {} address at pc 0x{:08x} requires runtime "
+					                     "guest-address translation",
+					                     address.kind == ResourceKind::Flat ? "FLAT" : "global",
+					                     address.first_use_pc);
 				}
 				return false;
 			}

src/graphics/shader/recompiler/ir/passes/ResourceTracking.cpp

@@ -764,6 +764,18 @@ private:
 			if (!IsAddressResourceKind(memory.kind)) {
 				return Fail(flags.pc, error, "address operation has invalid resource kind");
 			}
+			if (memory.kind == ResourceKind::Scratch) {
+				handle = inst.Arg(0).Resolve().TryInstruction();
+				if (handle == nullptr || handle->GetOpcode() != ValueOpcode::GetScratchResource ||
+				    handle->NumArgs() != 0) {
+					return Fail(flags.pc, error, "scratch operation requires GetScratchResource");
+				}
+				if (m_program.scratch_dwords == 0) {
+					return Fail(flags.pc, error,
+					            "scratch operation requires a nonzero AGC per-thread size");
+				}
+				return true;
+			}
 			bool unbased = false;
 			if (!GetAddressHandle(inst, inst.Arg(0), flags.pc, handle, source, unbased, error)) {
 				return false;