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

[Davide Italiano via llvm-commits]

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@@ -817,6 +820,12 @@ class BinaryFunction {
     return nullptr;
   }
 
+  /// Indicates if the function is safe to fold.
+  bool isSafeToICF() const { return IsSafeToICF; }
+
+  /// Sets the function is not safe to fold.
+  void setUnsafeICF() { IsSafeToICF = false; }
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dcci wrote:

A better interface might be `setSafeICF(bool isSafe)`, maybe. I'll let @maksfb comment.

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