[llvm] [DAG] fix wrong type check in DAGCombiner::visitSRA (PR #153762)

[via llvm-commits]

woruyu wrote:

> @woruyu @StephenYoung2754 We now have 2 identical PRs for this with exactly the same issue - no test coverage :(
Good catch—these two PRs are duplicates and both lack tests.
@StephenYoung2754 do you have specific ideas for the test coverage?

https://github.com/llvm/llvm-project/pull/153762