intel_stub: Claim to support I915_PARAM_HAS_CONTEXT_ISOLATION.
Modern kernels support I915_PARAM_HAS_CONTEXT_ISOLATION, which allows us to whack certain context registers with impunity. One of those is INSTPM/CS_DEBUG_MODE2, which controls whether Constant Buffer 0 is relative to dynamic state base address, or a general GPU address. If it's relative (the default), we can only push 3 ranges of UBOs. If it's absolute, we can push 4. So this affects our shader output. Follow the behavior of modern kernels and allow us to push all 4 ranges. Tested-by: Ian Romanick <email@example.com>
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