Depsgraph: Allow per-depsgraph debug flags

Currently only affects EVALUATION debug messages, rest are to be
supported on per-depsgraph level.

source/blender/depsgraph/intern/depsgraph_debug.cc

@@ -50,6 +50,20 @@ extern "C" {
 
 #include "util/deg_util_foreach.h"
 
+void DEG_set_debug_flags(Depsgraph *depsgraph, int flags)
+{
+	DEG::Depsgraph *deg_graph =
+	        reinterpret_cast<DEG::Depsgraph *>(depsgraph);
+	deg_graph->debug_flags = flags;
+}
+
+int DEG_get_debug_flags(const Depsgraph *depsgraph)
+{
+	const DEG::Depsgraph *deg_graph =
+	        reinterpret_cast<const DEG::Depsgraph *>(depsgraph);
+	return deg_graph->debug_flags;
+}
+
 bool DEG_debug_compare(const struct Depsgraph *graph1,
                        const struct Depsgraph *graph2)
 {