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Prevent snapshot purge while recording a function header.

Thanks to Sergey Kaplun.

(cherry picked from commit d459c6ce5)

This patch is a follow-up to the commit
7505e78bd "Handle on-trace OOM errors
from helper functions.". Since this commit, the `pcall()` (and
`xpcall()`) emits an additional snapshot, but the arguments to the
pcall-ed function are momentarily purged from the snapshot since they
are not used. Hence, in several cases `debug.getlocal()` can't find the
corresponding slot for the previous frame.

This patch prevents purging right after `pcall()`, `xpcall()` recording.

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

Part of tarantool/tarantool#12134

Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>

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