[llvm] [LRE] Adjust order of cases in eliminateDeadDefs (PR #162108)

[Philip Reames via llvm-commits]

preames wrote:

Compile time: https://llvm-compile-time-tracker.com/compare.php?from=25126117b5781e96453e5c5b1a9a6a6f8aa3989c&to=9b21b0268a85711946145817e05f6581964ceeac&stat=instructions:u

https://github.com/llvm/llvm-project/pull/162108