It's not the first time LLVM misidentifies modern CPUs.

I thought that all the logic in
src/gallium/auxiliary/gallivm/lp_bld_misc.cpp for setting +/-foo mattrs
would save us from this sort of grief.

On the other hand, I suppose that actually knowing the exact CPU model
allows it to better model instruction latency/throughput.

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https://bugs.launchpad.net/bugs/1549849

Title:
  11.2.0-rc1: llvmpipe tests fail if built on skylake

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