[llvm] [DSE] Apply initializes attribute to DSE (PR #107282)

[Mikael Holmén via llvm-commits]

mikaelholmen wrote:

@haopliu : As the build bots say, many lit tests fail when I've compiled with EXPENSIVE_CHECKS on.
Tests fail like
```LLVM ERROR: Function @test1 changed by DSEPass without invalidating analyses```

https://github.com/llvm/llvm-project/pull/107282