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sysprof: fix sampling outside the VM

If the signal by timer is handled outside the VM, the `g->vmstate`
equals zero. This was interpreted by the sysprof as the trace with the
corresponding number and leads to the assertion failure.

This patch fixes that by checking this case and dumping only the host
stack outside the VM.

Resolves tarantool/tarantool#11185
Resolves tarantool/tarantool#11429

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