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H A Dtraps.cdiff d74862007e0849fad8ba86447e6f05928f920640 Fri May 13 17:11:14 CEST 2022 Max Filippov <jcmvbkbc@gmail.com> xtensa: support artificial division by 0 exception

On xtensa cores wihout hardware division option division support
functions from libgcc react to division by 0 attempt by executing
illegal instruction followed by the characters 'DIV0'. Recognize this
pattern in illegal instruction exception handler and convert it to
division by 0.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>