[llvm] [llvm-profgen] Improve sample profile density (PR #92144)

[Lei Wang via llvm-commits]

wlei-llvm wrote:

> > what we want is just the final profile.
> 
> Is that difficult to change?

Ah, that should be even easier, just remove the 

```
  // Merge function samples of CS profile to calculate profile density.
  sampleprof::SampleProfileMap ContextLessProfiles;
  for (const auto &I : ProfileMap) {
    ContextLessProfiles[I.second.getName()].merge(I.second);
  }
    calculateAndShowDensity(ContextLessProfiles);
```
Then we don't need the post-pre-inliner one and only the last one. 




https://github.com/llvm/llvm-project/pull/92144