[S390] Cleanup & optimize bitops.
The bitops header is now a bit shorter and easier to understand since it uses less inline assembly. It requires some tricks to persuade the compiler to generate decent code. The ffz/ffs functions now use the _zb_findmap/_sb_findmap table as well. With this cleanup the new bitops for ext4 can be implemented with a few lines, instead of another large inline assembly. Signed-off-by: Martin Schwidefsky <email@example.com>
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