pkg/ipc: copy signal and coverage

We used to optimize the memory usage by making the slices of individual
CallInfo structs point to the shared memory buffer between syz-fuzzer
and executor.

However, this puts very strict expectations on all pkg/ipc users and
complicates the decoupling of the fuzzing logic from individual proc
loops.

Let's try to live without this optimization. When compared with the cost
of a single syz-executor execution, the cost of array copying is very
very small anyway.

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