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Add the infrastructure for guest exception handling in riscv selftests. Customized handlers can be enabled by vm_install_exception_handler(vector) or vm_install_interrupt_handler(). The code is inspired from that of x86/arm64. Signed-off-by: Haibo Xu <haibo1.xu@intel.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Anup Patel <anup@brainfault.org>