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Avoid assertion in case of stack overflow from stitched trace.

Reported by Sergey Bronnikov. Fixed by Sergey Kaplun.

(cherry-picked from commit 1d75cd4d7)

When we exit from a stitched trace due to the Lua stack overflow
error, we cannot determine the bytecode position properly, and
because of that, we get the incorrect bytecode instruction in
`debug_framepc`. This patch fixes this behavior, so the
`debug_framepc` now returns `NO_BCPOS` for this case.

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

Part of tarantool/tarantool#9145

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