Shadow of Mordor has randomly dancing black shadows on Talion's face
Commit 7025dbe7 (nir: Skip emitting no-op movs from the builder.) regresses Shadow of Mordor rendering on Intel Kabylake GT2 using Iris.
Simply launch the game, hit escape until you get to the main menu. The menu shows a close-up of Talion, and after 7025dbe7 there is obvious black noise that flickers and moves about on his face.
Presumably this will be easy to figure out by looking at the shaders, but I haven't done that step yet (just finished the bisect and wrote the report so far).