Introduce lluau_checkstack(L, n); use instead of luaL_checkstack().

luaL_checkstack() accepts a third parameter which is included in the stack
overflow error message. We've been passing nullptr, leading to messages of the
form "stack overflow ((null))". lluau_checkstack() implicitly passes
__FUNCTION__, so we can distinguish which underlying luaL_checkstack() call
encountered the stack overflow condition.

Also, when calling each atexit() function, pass Luau's debug.traceback()
function as the lua_pcall() error handler. This should help diagnose errors in
atexit() functions.

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