[llvm] [RISC-V] Fix crash with late stack realignment requirement (PR #83496)

[Wang Pengcheng via llvm-commits]

https://github.com/wangpc-pp commented:

Thanks for fixing this problem! I know there will be a lot of problems when ILP32E meets with latest ratified extensions…

https://github.com/llvm/llvm-project/pull/83496