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After the CRIU process saves the parasite code for the target thread in
the shared mmap, it is necessary to call __clear_cache before the target
thread executes the code.
Without this step, the target thread may not see the correct code to
execute, which can result in a SIGILL signal.
For the specific arm64 case. this is important so that the newly copied
code is flushed from d-cache to RAM, so that the target thread sees the
new code.
The change is based on commit
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