Add fls_long and roundup_pow_of_two helpers
It's always nice to have a log2 handy, and the vfio-pci code will need to perform power of two allocation from an arbitrary size. Add fls_long and roundup_pow_of_two, based on the GCC builtin. Reviewed-by:Punit Agrawal <punit.agrawal@arm.com> Signed-off-by:
Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by:
Will Deacon <will.deacon@arm.com>
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