[llvm] [NFC][SelectionDAG] Replace generic @llvm.expect.with.probability codegen test with X86 test (PR #117848)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon approved this pull request.

LGTM - I expect other targets will hit issues at some point with this intrinsic, but they can hopefully just copy what x86 does.

https://github.com/llvm/llvm-project/pull/117848