[llvm] [DSE] Enable initializes improvement (PR #119116)

[Haopeng Liu via llvm-commits]

haopliu wrote:

Here is the compile-time comparison of this enabling (no meaningful diff).

https://llvm-compile-time-tracker.com/compare.php?from=118f7b95c8546826f222c13daea47cde4aa97bc9&to=2a97fc34b31f2e1f9409c5ff8950c5d630cf0b70&stat=instructions%3Au

https://github.com/llvm/llvm-project/pull/119116