Propagate deserialization errors for IpcSharedMemory #392
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This makes
IpcSharedMemory::deserialize
return an error if the deserialized data references an shared memory region region that does not exist.Part of servo/servo#36792. This doesn't fix the actual issue, but gives users of
ipc-channel
the opportunity to handle the error gracefully. Servo is technically at fault for panicking now, because serialized data being corrupted is not unrealistic.