d608ca0363
r5 and r6 are always getting lowered. Will prevent a regression with VBO lowering on a shader which has stride=0 and hence gets the vertex ID read optimized out with NIR: dEQP-GLES2.functional.draw.random.50 Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19971>