[llvm] [RISCV][ISel] Fix types in `tryFoldSelectIntoOp` (PR #90659)

[Tom Stellard via llvm-commits]

tstellar wrote:

Hi @dtcxzyw (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix.  When you are done, please add the release:note label to this PR.

https://github.com/llvm/llvm-project/pull/90659