i965: Drop dead Gen8+ code from Gen7/sometimes-HSW driver hooks.
i965: Drop dead Gen8+ code from Gen7/sometimes-HSW driver hooks.

These driver hooks are not used when MI_MATH and MI_LOAD_REGISTER_REG
are supported, which Gen8+ can always do.  So this code is dead.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Iago Toral Quiroga <a847aabaac44184372f6b1cd1a59aa254daaeb0b@igalia.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler