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Restore state when recording __concat metamethod throws an error.

Thanks to Sergey Kaplun.

(cherry picked from commit 7421a1b33)

Since neither `rec_cat()` nor `lj_record_ret()` restore the Lua stack,
if the error is raised, it leads either to a crash in `BC_RET` or to the
"unbalanced stack" assertion failure.

This patch protects the `rec_mm_arith()`, which can raise an error. Its
caller returns the negated error code to be rethrown in case of the
caught error.

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

Part of tarantool/tarantool#10199

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