GPU: Include material UUID in debug name

When debugging, distinguishing between
material variants used for the main colour
pass and depth can be problematic.

Including the shader UUID in the material
name can aid in distinguishing between
differing configurations of the same
source material graph.

Authored by Apple: Michael Parkin-White

@@ -841,0 +841,4 @@
+#ifndef NDEBUG
+  /* Include shader_uuid to be able to more easily differentiate between depth/shadow material
+   * shaders. */
+  BLI_snprintf(mat->name, 64, "%s_%u\n", name, mat->uuid);