The intention of the bus_be naming was for those to be the no-endian-swapping
and for the bus_le to be endian-swapping in all the functions.
This naming breaks down when we're actually are running in LE and need to
use the opposite sense.
As such, rename bs_be_* to native_bs_* and rename bs_le_* to swapped_bs_*.
No functional change.
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