This has no behavior change, but it has a semantic one. This CL is an
assertion that all BIGNUM functions tolerate non-minimal BIGNUMs now.
Specifically:

- Functions that do not touch top/width are assumed to not care.

- Functions that do touch top/width will be changed by this CL. These
  should be checked in review that they tolerate non-minimal BIGNUMs.

Subsequent CLs will start adjusting the widths that BIGNUM functions
output, to fix timing leaks.

Bug: 232
Change-Id: I3a2b41b071f2174452f8d3801bce5c78947bb8f7
Reviewed-on: https://boringssl-review.googlesource.com/25257
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>