bn/bn_{div|shift}.c: introduce fixed-top interfaces.
Fixed-top interfaces tolerate zero-padded inputs and facilitate constant-time-ness. bn_div_fixed_top tolerates zero-padded dividend, but not divisor. It's argued that divisor's length is public even when value is secret. [extended tests] Reviewed-by: Paul Dale <paul.dale@oracle.com> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7589) (cherry picked from commit 3a4a88f436ed1dd1165e0b59c1ca4a25e9e1d690)
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a7e8ab41
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