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

[Divyansh Yadav via llvm-commits]

schizophrenicmaniac 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.

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