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When running on a system with a CPU family/model beyond the last entry
in the CpuUarch table, the CPU id to CpuUarch mapping code tries to
access an invalid iterator/entry and crashes. Check for this case and
return an empty CpuUarch instead.

Bug: 1021000
Change-Id: I2bc19427a03c0fe6906838bdcb2134021fc213df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893200Reviewed-by: Gabriel Marin <gmx@chromium.org>
Commit-Queue: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Cr-Commit-Position: refs/heads/master@{#712942}