[llvm] [RISCV] Don't truncate MaxAlignment to int when realigning the stack (PR #228225)

[Alexander Richardson via llvm-commits]

arichardson wrote:

> @MitchBriles @arichardson Split it into two commits: the first adds the test with the current output and a FIXME, the second has the fix and the updated check lines.

Thanks, but since LLVM enforces squash+merge, the baseline test needs to be in a separate pull request and then you can rebase this one once the other one has been merged.

https://github.com/llvm/llvm-project/pull/228225