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The number of exception for risc-v is 16 (0 ~ 15) for the machine ISA version 1.12 or earlier, the number of exception is 20 (0 ~ 19) from the ISA version 1.13. And maybe changed in the future. Using a dedicated option to control the exception number to allow the earlier version chip with customized exception number (e.g. 16 ~ 19 used) to define the exception reason string correctly. Signed-off-by: Huang Qi <huangqi3@xiaomi.com>