=> R1 = source buffer
R2 = destination buffer (can equal source)
R3 = number of bytes (must be a multiple of 4)
<= R0 and flags corrupted.
This SWI takes a list of bytes and reverses the bits of each byte. This is
useful for reversing the bitmaps (flipping about the y axis) of 8*8 pixel
characters at one bit per pixel (ie r_cbpl = 1, r_cbpc = 8).
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