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In some xtensa configurations there may be system/user registers in xtensa-modules with negative index. ISA initialization for such config may clobber heap and result in program termination. Don't update lookup table entries for register with negative indices. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>