set the default ARB_ARCH target to native (#1039)
* Set the default ARB_ARCH target to native. * Tweak travis config to avoid gcc 6 bug that incorrectly implies amd64 target can do avx512.
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* Set the default ARB_ARCH target to native. * Tweak travis config to avoid gcc 6 bug that incorrectly implies amd64 target can do avx512.