[llvm] [BOLT] Add support for safe-icf (PR #116275)

[Maksim Panchenko via llvm-commits]

================
@@ -817,6 +820,12 @@ class BinaryFunction {
     return nullptr;
   }
 
+  /// Returns true if function is referenced in none-control flow instructions..
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maksfb wrote:

```suggestion
  /// Return true if function is referenced in non-control flow instructions..
```

https://github.com/llvm/llvm-project/pull/116275