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Mark CONV as non-weak, to prevent elimination of its side-effect.

An unused guarded CONV int.num cannot be omitted in general.

(cherry-picked from commit 881d02d31)

In some cases, an unused `CONV int.num` omission in `DUALNUM` mode
may lead to a guard absence, resulting in invalid control flow
branching and undefined behavior. For a comprehensive example of
the described situation, please refer to the comment
in `test/tarantool-tests/mark-conv-non-weak.test.lua`.

Maxim Kokryashkin:
* added the description and the test for the problem

Part of tarantool/tarantool#9145

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