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lua: prohibit fiber yield when GC hook is active

While running GC hook (i.e. __gc  metamethod) garbage collector engine
is "stopped": the memory penalty threshold is set to LJ_MAX_MEM and
incremental GC step is not triggered as a result. Ergo, yielding the
execution at the finalizer body leads to further running platform with
disabled LuaJIT GC. It is not re-enabled until the yielded fiber doesn't
get the execution back.

This changeset extends <cord_on_yield> routine with the check whether GC
hook is active. If the switch-over occurs in scope of __gc metamethod
the platform is forced to stop its execution with EXIT_FAILURE and calls
panic routine before the exit.

Relates to #4518
Follows up #4727

Reviewed-by: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Reviewed-by: Sergey Ostanevich <sergos@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>
(cherry picked from commit d3f1dd720)

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