iommufd: Add additional invariant assertions
These are on performance paths so we protect them using the CONFIG_IOMMUFD_TEST to not take a hit during normal operation. These are useful when running the test suite and syzkaller to find data structure inconsistencies early. Link: https://lore.kernel.org/r/18-v6-a196d26f289e+11787-iommufd_jgg@nvidia.comTested-by: Yi Liu <yi.l.liu@intel.com> Tested-by: Matthew Rosato <mjrosato@linux.ibm.com> # s390 Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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