Sergey,

This patch refactors the aforementioned test to make its code style
closer to ours.

Relates to tarantool/tarantool#9398
---

thanks for the patch! LGTM with a minor:

probably line 10 needs more whitespaces:

>      do local a,b,c,d,e,f,g,h,i,j,k,l,m,n end -- Ensure bigger frame size.

 test/LuaJIT-tests/lang/gc_stack.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/LuaJIT-tests/lang/gc_stack.lua b/test/LuaJIT-tests/lang/gc_stack.lua
index cd3d8f90..8aee57e3 100644
--- a/test/LuaJIT-tests/lang/gc_stack.lua
+++ b/test/LuaJIT-tests/lang/gc_stack.lua
@@ -1,5 +1,5 @@
 do --- Marking sparse stack.
-  local t = setmetatable({}, { __index=function(t, k)
+  local t = setmetatable({}, { __index = function(t, k)
     k = k - 1
     if k == 0 then
       collectgarbage() -- Mark stack, including holes.