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Fix recording of __concat metamethod.

Reported by Elias Oelschner. Analyzed by XmiliaH.

(cherry-picked from commit 3ee3c9cfa)

During the recording of `__concat` methametod, the `rec_mm_arith`
function overrides stack slots that are not restored for GC64
mode later after the call. This leads to a segmentation fault
later on. This patch fixes the issue by accounting for those
additional slots in the array used for restoring stack values.

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

Part of tarantool/tarantool#9145

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