aco: Add function call attributes

ACO needs RADV to set certain attributes on NIR functions to help with
compilation of function calls.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34531>

src/amd/compiler/aco_nir_call_attribs.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright © 2024 Valve Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef ACO_NIR_CALL_ATTRIBS_H
+#define ACO_NIR_CALL_ATTRIBS_H
+
+enum aco_nir_call_abi {
+   ACO_NIR_CALL_ABI_RT_RECURSIVE,
+   ACO_NIR_CALL_ABI_TRAVERSAL,
+   ACO_NIR_CALL_ABI_AHIT_ISEC,
+};
+
+enum aco_nir_function_attribs {
+   ACO_NIR_FUNCTION_ATTRIB_ABI_MASK = 0x7F,
+   /* Different lanes can have different values for the function pointer to call */
+   ACO_NIR_FUNCTION_ATTRIB_DIVERGENT_CALL = 0x1 << 7,
+   /* Function will never return */
+   ACO_NIR_FUNCTION_ATTRIB_NORETURN = 0x2 << 7,
+};
+
+enum aco_nir_parameter_attribs {
+   /* Parameter value is not used by any callee and does not need to be preserved */
+   ACO_NIR_PARAM_ATTRIB_DISCARDABLE = 0x1,
+};
+
+#endif /* ACO_NIR_CALL_ATTRIBS_H */