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DUALNUM: Fix recording of loops broken by previous change.

Thanks to Nicholas Davies.

(cherry picked from commit 1c3b5a4d7)

The previous commit forbids recording for the NaN control variables
stack slots. These checks are false positives for integers in DUALNUM
mode. This prevents any for loop with integers as slots from being
recorded.

This patch fixes the checks.

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

Part of tarantool/tarantool#12134

Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>
(cherry picked from commit a8d23e066)

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