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FFI: Shrink container of packed bitfield.

Reported by Huang Haiyang.

(cherry picked from commit e4c7d8b38)

The bitfield of packed structure uses the original type size, which
leads to heap-buffer-overflow access on conversions.

This patch fixes it by adjusting the size of the bitfield container when
necessary.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#12880

Reviewed-by: Evgeniy Temirgaleev <e.temirgaleev@tarantool.org>
Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>

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