bn/bn_lib.c: add BN_FLG_FIXED_TOP flag.
The new flag marks vectors that were not treated with bn_correct_top, in other words such vectors are permitted to be zero padded. For now it's BN_DEBUG-only flag, as initial use case for zero-padded vectors would be controlled Montgomery multiplication/exponentiation, not general purpose. For general purpose use another type might be more appropriate. Advantage of this suggestion is that it's possible to back-port it... bn/bn_div.c: fix memory sanitizer problem. bn/bn_sqr.c: harmonize with BN_mul. Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6707) (cherry picked from commit 305b68f1) Resolved conflicts: crypto/bn/bn_lcl.h
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