swr: Prune empty nodes in CalculateProcessorTopology.
CalculateProcessorTopology tries to figure out system topology by parsing /proc/cpuinfo to determine the number of threads, cores, and NUMA nodes. There are some architectures where the "physical id" begins with 1 rather than 0, which was creating and empty "0" node and causing a crash in CreateThreadPool. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97102 Reviewed-By:George Kyriazis <george.kyriazis@intel.com> CC: <mesa-stable@lists.freedesktop.org> (cherry picked from commit b829206b)
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