i965/fs: Hook up coherent framebuffer reads to the NIR front-end.
i965/fs: Hook up coherent framebuffer reads to the NIR front-end.

Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler