io_uring: refill request cache in memory order

The allocator will generally return memory in order, but
__io_alloc_req_refill() then adds them to a stack and we'll extract them
in the opposite order. This obviously isn't a huge deal, but:

1) it makes debugging easier when they are in order
2) keeping them in-order is the right thing to do
3) reduces the code for adding them to the stack

Just add them in reverse to the stack.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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