[Tarantool-patches] [PATCH luajit] test: adapt tests checking traceback in tail call

[Maxim Kokryashkin via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

LuaJIT does not provide information about tail calls
unlike, Lua 5.1 does, so a traceback in LuaJIT may be different.

Consider this chunck of code:
```
local function checktraceback (co, p)
  local tb = debug.traceback(co)
  local i = 0
  for l in string.gmatch(tb, "[^\n]+\n?") do
    assert(i == 0 or string.find(l, p[i]))
    i = i+1
  end
  assert(p[i] == nil)
end

local function f (n)
  if n > 0 then return f(n-1)
  else coroutine.yield() end
end

local co = coroutine.create(f)
coroutine.resume(co, 3)
checktraceback(co, {"yield", "db.lua", "tail", "tail", "tail"})
```

For LuaJIT traceback looks like the following:
```
stack traceback:
        [C]: in function 'yield'
        db.lua:436: in function <db.lua:434>
```

And for Lua 5.1 it looks like the following:
```
stack traceback:
        [C]: in function 'yield'
        db.lua:436: in function <db.lua:434>
        (tail call): ?
        (tail call): ?
        (tail call): ?
```

Closes tarantool/tarantool#5703
Part of tarantool/tarantool#5845
Part of tarantool/tarantool#4473
---
Issue: https://github.com/tarantool/tarantool/issues/5703
GitHub branch: https://github.com/tarantool/luajit/tree/fckxorg/gh-5703-adapt-traceback-tail-call-PUC-Rio

 test/PUC-Rio-Lua-5.1-tests/db.lua | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/test/PUC-Rio-Lua-5.1-tests/db.lua b/test/PUC-Rio-Lua-5.1-tests/db.lua
index 56f59ea8..f254cde6 100644
--- a/test/PUC-Rio-Lua-5.1-tests/db.lua
+++ b/test/PUC-Rio-Lua-5.1-tests/db.lua
@@ -475,9 +475,8 @@ end
 
 local co = coroutine.create(f)
 coroutine.resume(co, 3)
--- FIXME: Behavior is different for LuaJIT.
--- See the comment to `h()` above. Test is disabled for LuaJIT.
--- checktraceback(co, {"yield", "db.lua", "tail", "tail", "tail"})
+-- Test is adapted to the behaviour of LuaJIT.
+checktraceback(co, {"yield", "db.lua"})
 
 
 co = coroutine.create(function (x)
-- 
2.33.0