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Add stack check to pcall/xpcall.

Analyzed by Peter Cawley.

(cherry picked from commit a4c164043)

In the commit "LJ_FR2: Fix stack checks in vararg calls."
stack overflow in `pcall()`/`xpcall()` was fixed partially and
there are still cases where stack overflow happens, see comments
in the test. The patch add stack check to `pcall()` and `xpcall()`.

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

Part of tarantool/tarantool#11691

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