i965: Update compaction code to handle Skylake like Cherryview.
i965: Update compaction code to handle Skylake like Cherryview.

Matt requested this in review feedback on the original patch, which I
completely missed when pushing this series.  Kristian also made this
change, but I grabbed the wrong version of the patch.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler