tools: add check-syzos.sh

As shown in https://github.com/google/syzkaller/issues/5565,
SYZOS code in the `guest` section cannot reference global data,
because it is relocated into the guest memory.

While arm64 executor has a dynamic check for data accesses, it is
virtually impossible to do the same on x86 without implementing an
x86 disassembler. Instead of doing so, introduce a build-time script
that will detect instructions referencing global data on a best-effort
basis.

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