i965: Disable ARB_fragment_shader_interlock for platforms prior to GEN9
ARB_fragment_shader_interlock depends on memory fences to ensure fragment ordering and this ordering guarantee is only supported from GEN9 onwards.
/cc @majanes
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ARB_fragment_shader_interlock depends on memory fences to ensure fragment ordering and this ordering guarantee is only supported from GEN9 onwards.
/cc @majanes