llvmpipe: include gallivm perf flags in shader cache.
Otherwise if you set perf flags, then don't set them, they won't take affect.
Fixes: 6c0c61cb ("llvmpipe: add infrastructure for disk cache support")
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Otherwise if you set perf flags, then don't set them, they won't take affect.
Fixes: 6c0c61cb ("llvmpipe: add infrastructure for disk cache support")