[llvm] [DAGCombiner] Avoid double deletion when replacing multiple frozen/unfrozen uses (PR #155427)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Compile-time result looks neutral: https://llvm-compile-time-tracker.com/compare.php?from=704a10c6cefbe28dcb3678cc69c381bfdd7fef4b&to=173e0b52384ed5951b80315c0c20218952489e67&stat=instructions:u

https://github.com/llvm/llvm-project/pull/155427