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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, the Lua and JIT stacks are not synchronized, and they
won't be as long as the mentioned error is raised. 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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