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Prevent compile of __concat with tailcall to fast function.

E.g. __concat = function() return setmetatable(...) end
Reported by Fezile Manana.

(cherry-picked from commit 75ee3a615)

During the recording of concat with tailcall to fast function,
the fast function recording is postponed. This implementation
may lead to the absence of side effects from fast-function and
incorrect behavior as a result. For a comprehensive example,
see the comment in the test.

Part of tarantool/tarantool#9145

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